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1. High-Energy Neutrino Follow-up at the Baikal-GVD Neutrino Telescope

Author

Z. Bardačová, T. I. Gress, M. S. Katulin, K. V. Konishchev, K.V. Golubkov, Lukas Fajt, Mark Shelepov, E. V. Ryabov, A. V. Skurikhin, M.M. Kolbin, W. Noga, B. A. Tarashchansky, V. A. Kozhin, D. N. Zaborov, A.P. Koshechkin, T. V. Elzhov, V. Ya. Dik, G.B. Safronov, A.V. Avrorin, Aleksandr Gafarov, E.N. Pliskovsky, O.G. Kebkal, V.D. Rushay, M.I. Rozanov, A. A. Doroshenko, Zh.-A.M. Dzhilkibaev, R. R. Mirgazov, A.G. Solovjev, V. Nazari, V. B. Brudanin, V.F. Kulepov, N. M. Budnev, S. V. Fialkovski, E.V. Khramov, Fedor Šimkovic, D. P. Petukhov, V. M. Aynutdinov, Yu. V. Yablokova, Sergey Yakovlev, K. A. Kopański, N.S. Gorshkov, R. Bannasch, E. O. Sushenok, R. Dvornicky, A.V. Korobchenko, I. A. Belolaptikov, Konstantin Kebkal, I. Stekl, R. Ivanov, V.A. Tabolenko, Dmitry V. Naumov, A.D. Avrorin, G.V. Domogatsky, B.A. Shaybonov, A. N. Dyachok, E. Eckerová, Olga Suvorova, M.K. Kryukov, M. V. Milenin, M.N. Sorokovikov, and M.V. Kruglov

Subjects
Physics, Physics::Instrumentation and Detectors, 010308 nuclear & particles physics, Astrophysics::High Energy Astrophysical Phenomena, Detector, Neutrino telescope, Astrophysics::Instrumentation and Methods for Astrophysics, Astronomy, Astronomy and Astrophysics, 01 natural sciences, Monitoring program, law.invention, Telescope, Data acquisition, Space and Planetary Science, law, 0103 physical sciences, Neutrino, Underwater, 010303 astronomy & astrophysics, Event reconstruction
Abstract

The Baikal-GVD deep underwater neutrino experiment participates in the international multi-messenger program to detect the astrophysical sources of high- and ultrahigh-energy cosmic-ray particles, being at the stage of array deployment and a step-by-step increase of the telescope’s effective volume to the scale of a cubic kilometer. At present, the telescope consists of seven clusters containing 2016 photodetectors. The effective volume of the detector has reached 0.35 km $${}^{3}$$ for the selection of shower events from neutrino interactions in Baikal water. The experimental data have been accumulated in a continuous exposure mode since 2015, allowing a prompt data analysis and a celestial-sphere monitoring program to be implemented in real time. We discuss the structure of the data acquisition system, describe the physical event reconstruction procedure in the mode of fast response to alerts, and present the results of our analysis of nine alerts from the polar IceCube telescope from early September to late October 2020.

Published
2021
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2. Neutrino Telescope in Lake Baikal: Present and Nearest Future

Author

M.B. Milenin, Ivan Štekl, V. Y. Dik, I. A. Belolaptikov, V. A. Kozhin, V.D. Rushay, V. Nazari, Mark Shelepov, V. B. Brudanin, V.F. Kulepov, I. V. Borina, D. N. Zaborov, O.G. Kebkal, A. P. Stromakov, M.I. Rozanov, A.P. Koshechkin, B.A. Tarashansky, Yury Malyshkin, A. E. Sirenko, A. A. Doroshenko, A.G. Solovjev, Zh.-A.M. Dzhilkibaev, Z. Bardаčová, Aleksandr Gafarov, K.V. Golubkov, M.V. Kruglov, А. D. Avrorin, K.V. Konischev, Pa. Malecki, B.A. Shaybonov, Evgeniy Khramov, A. V. Skurikhin, M.N. Sorokovikov, T. V. Elzhov, A. N. Dyachok, V.A. Tabolenko, Konstantin Kebkal, W. Noga, T. I. Gress, Lukas Fajt, G.B. Safronov, A.V. Korobchenko, R. R. Mirgazov, E. V. Ryabov, Rastislav Dvornický, N. M. Budnev, E. Eckerová, M.M. Kolbin, A.V. Avrorin, E.N. Pliskovsky, Olga Suvorova, D. P. Petukhov, G.V. Domogatsky, M. S. Katulin, V. M. Aynutdinov, K. A. Kopański, Sergey Yakovlev, M.K. Kryukov, Dmitry V. Naumov, V. A. Allakhverdyan, Fedor Šimkovic, N.S. Gorshkov, Y. V. Yablokova, R. Bannasch, S.V. Fialkovsky, and E. O. Sushenok

Subjects
Physics, Neutrino telescope, Astronomy
Published
2021
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3. Observations of track-like neutrino events with Baikal-GVD

Author

Dmitry Zaborov, V.A. Allakhverdyan, A.D. Avrorin, A.V. Avrorin, V.M. Aynutdinov, R. Bannasch, Zuzana Bardačová, I.A. Belolaptikov, I.V. Borina, V.B. Brudanin, N.M. Budnev, V.Y. Dik, G.V. Domogatsky, A.A. Doroshenko, Rastislav Dvornicky, A.N. Dyachok, Zh.-A.M. Dzhilkibaev, Eliška Eckerová, T.V. Elzhov, L. Fajt, Stanislav Vasilevich Fialkovsky, A.R. Gafarov, K.V. Golubkov, N.S. Gorshkov, T.I. Gress, M.S. Katulin, K.G. Kebkal, O.G. Kebkal, E.V. Khramov, M.M. Kolbin, K.V. Konischev, K.A. Kopański, A.V. Korobchenko, A.P. Koshechkin, V.A. Kozhin, M.V. Kruglov, M.K. Kryukov, V.F. Kulepov, Pa. Malecki, Y.M. Malyshkin, M.B. Milenin, R.R. Mirgazov, D.V. Naumov, V. Nazari, W. Noga, D.P. Petukhov, E.N. Pliskovsky, M.I. Rozanov, V.D. Rushay, E.V. Ryabov, G.B. Safronov, B.A. Shaybonov, M.D. Shelepov, Fedor Šimkovic, A.E. Sirenko, A.V. Skurikhin, A.G. Solovjev, M.N. Sorokovikov, Ivan Štekl, A.P. Stromakov, E.O. Sushenok, O.V. Suvorova, V.A. Tabolenko, B.A. Tarashansky, Y.V. Yablokova, and S.A. Yakovlev

Subjects
High Energy Astrophysical Phenomena (astro-ph.HE), Physics, Muon, Physics::Instrumentation and Detectors, Track (disk drive), Astrophysics::High Energy Astrophysical Phenomena, Detector, Monte Carlo method, FOS: Physical sciences, Flux, Reconstruction algorithm, Nuclear physics, Neutrino detector, High Energy Physics::Experiment, Neutrino, Astrophysics - High Energy Astrophysical Phenomena, Astrophysics - Instrumentation and Methods for Astrophysics, Instrumentation and Methods for Astrophysics (astro-ph.IM)
Abstract

The Baikal Gigaton Volume Detector (Baikal-GVD) is a km$^3$-scale neutrino detector currently under construction in Lake Baikal, Russia. The detector currently consists of 2304 optical modules arranged on 64 vertical strings. Further extension of the array is planned for March 2022. The data from the partially complete array have been analyzed using a $\chi^2$-based track reconstruction algorithm. After suppression of the downward-going atmospheric muon background, a flux of upward-going neutrino events is observed, dominated by the atmospheric neutrinos. The observed flux is in good agreement with Monte Carlo predictions., Comment: 8 pages, 5 figures, to be published in Proceedings of the 37th International Cosmic Ray Conference (ICRC-2021), 12-23 July 2021

Published
2021

4. Positioning system for Baikal-GVD

Author

A. A. Doroshenko, K.V. Konischev, Zh.-A.M. Dzhilkibaev, N.S. Gorshkov, Dmitry V. Naumov, B.A. Shaybonov, M.B. Milenin, D. N. Zaborov, Fedor Šimkovic, A.P. Koshechkin, A. E. Sirenko, A. P. Stromakov, A. N. Dyachok, Y. V. Yablokova, G.B. Safronov, A. V. Skurikhin, N. M. Budnev, Rastislav Dvornický, Evgeniy Khramov, I. A. Belolaptikov, R. R. Mirgazov, A.V. Avrorin, V.D. Rushay, B.A. Tarashansky, D. P. Petukhov, Konstantin Kebkal, W. Noga, V. A. Kozhin, V. A. Allakhverdyan, K. A. Kopański, Yury Malyshkin, E. Eckerová, V. Nazari, Olga Suvorova, V. Y. Dik, E.N. Pliskovsky, Mark Shelepov, O.G. Kebkal, M.I. Rozanov, I. V. Borina, M.V. Kruglov, S.V. Fialkovski, R. Bannasch, E. O. Sushenok, A.G. Solovjev, Pa. Malecki, I. Stekl, M.K. Kryukov, V.A. Tabolenko, T. I. Gress, Lukas Fajt, K.V. Golubkov, E. V. Ryabov, M.M. Kolbin, M.N. Sorokovikov, T. V. Elzhov, V. M. Aynutdinov, Sergey Yakovlev, A.V. Korobchenko, A.D. Avrorin, G.V. Domogatsky, V. B. Brudanin, V.F. Kulepov, Aleksandr Gafarov, M. S. Katulin, and Z. Bardačová

Subjects
Photomultiplier, Physics - Instrumentation and Detectors, Positioning system, Neutrino telescope, FOS: Physical sciences, Instrumentation and Detectors (physics.ins-det), law.invention, Telescope, Upgrade, law, Acoustic modem, Polling, Astrophysics - Instrumentation and Methods for Astrophysics, Instrumentation and Methods for Astrophysics (astro-ph.IM), Trilateration, Geology, Remote sensing
Abstract

Baikal-GVD is a kilometer scale neutrino telescope currently under construction in Lake Baikal. Due to water currents in Lake Baikal, individual photomultiplier housings are mobile and can drift away from their initial position. In order to accurately determine the coordinates of the photomultipliers, the telescope is equipped with an acoustic positioning system. The system consists of a network of acoustic modems, installed along the telescope strings and uses acoustic trilateration to determine the coordinates of individual modems. This contribution discusses the current state of the positioning in Baikal-GVD, including the recent upgrade to the acoustic modem polling algorithm., Presented at 37th International Cosmic Ray Conference (ICRC 2021)

Published
2021
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5. Experimental string with fiber optic data acquisition for Baikal-GVD

Author

Vladimir Aynutdinov, A. Allakhverdyan, A.D. Avrorin, A.V. Avrorin, R. Bannasch, Z. Bardаčová, I.A. Belolaptikov, I.V. Borina, V.B. Brudanin, N.M. Budnev, V.Y. Dik, G.V. Domogatsky, A.A. Doroshenko, Rastislav Dvornicky, A.N. Dyachok, Zh.-A.M. Dzhilkibaev, Eliška Eckerová, T.V. Elzhov, L. Fajt, Stanislav Vasilevich Fialkovsky, A.R. Gafarov, K.V. Golubkov, N.S. Gorshkov, T.I. Gress, M.S. Katulin, K.G. Kebkal, O.G. Kebkal, E.V. Khramov, M.M. Kolbin, K.V. Konischev, K.A. Kopanski, A.V. Korobchenko, A.P. Koshechkin, V.A. Kozhin, M.V. Kruglov, M.K. Kryukov, V.F. Kulepov, Pa. Malecki, Y.M. Malyshkin, M.B. Milenin, R.R. Mirgazov, D.V. Naumov, V. Nazari, W. Noga, D.P. Petukhov, E.N. Pliskovsky, M.I. Rozanov, V.D. Rushay, E.V. Ryabov, G.B. Safronov, B.A. Shaybonov, M.D. Shelepov, Fedor Šimkovic, A.E. Sirenko, A.V. Skurikhin, A.G. Solovjev, M.N. Sorokovikov, Ivan Štekl, A.P. Stromakov, E.O. Sushenok, O.V. Suvorova, V.A. Tabolenko, B.A. Tarashansky, Y.V. Yablokova, S.A. Yakovlev, and D.N. Zaborov

Published
2021
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6. Time synchronization of Baikal-GVD clusters

Author

Vladimir Aynutdinov, V.A. Allakhverdyan, A.D. Avrorin, A.V. Avrorin, R. Bannasch, Z. Bardаčová, I.A. Belolaptikov, I.V. Borina, V.B. Brudanin, N.M. Budnev, V.Y. Dik, G.V. Domogatsky, A.A. Doroshenko, Rastislav Dvornicky, A.N. Dyachok, Zh.-A.M. Dzhilkibaev, Eliška Eckerová, T.V. Elzhov, L. Fajt, Stanislav Vasilevich Fialkovsky, A.R. Gafarov, K.V. Golubkov, N.S. Gorshkov, T.I. Gress, M.S. Katulin, K.G. Kebkal, O.G. Kebkal, E.V. Khramov, M.M. Kolbin, K.V. Konischev, K.A. Kopanski, A.V. Korobchenko, A.P. Koshechkin, V.A. Kozhin, M.V. Kruglov, M.K. Kryukov, V.F. Kulepov, Pa. Malecki, Y.M. Malyshkin, M.B. Milenin, R.R. Mirgazov, D.V. Naumov, V. Nazari, W. Noga, D.P. Petukhov, E.N. Pliskovsky, M.I. Rozanov, V.D. Rushay, E.V. Ryabov, G.B. Safronov, B.A. Shaybonov, M.D. Shelepov, Fedor Šimkovic, A.E. Sirenko, A.V. Skurikhin, A.G. Solovjev, M.N. Sorokovikov, Ivan Štekl, A.P. Stromakov, E.O. Sushenok, O.V. Suvorova, V.A. Tabolenko, B.A. Tarashansky, Y.V. Yablokova, S.A. Yakovlev, and D.N. Zaborov

Published
2021
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7. Performance of the muon track reconstruction with the Baikal-GVD neutrino telescope

Author

Grigory Safronov, V.A. Allakhverdyan, A.D. Avrorin, A.V. Avrorin, V.M. Aynutdinov, R. Bannasch, Zuzana Bardačová, I.A. Belolaptikov, V.B. Brudanin, N.M. Budnev, V.Y. Dik, G.V. Domogatsky, A.A. Doroshenko, Rastislav Dvornicky, A.N. Dyachok, Zh.-A.M. Dzhilkibaev, Eliška Eckerová, T.V. Elzhov, L. Fajt, Stanislav Vasilevich Fialkovsky, A.R. Gafarov, K.V. Golubkov, N.S. Gorshkov, T.I. Gress, M.S. Katulin, K.G. Kebkal, O.G. Kebkal, E.V. Khramov, M.M. Kolbin, K.V. Konischev, K.A. Kopański, A.V. Korobchenko, A.P. Koshechkin, V.A. Kozhin, M.V. Kruglov, M.K. Kryukov, V.F. Kulepov, Pa. Malecki, Y.M. Malyshkin, M.B. Milenin, R.R. Mirgazov, D.V. Naumov, V. Nazari, W. Noga, D.P. Petukhov, E.N. Pliskovsky, M.I. Rozanov, V.D. Rushay, E.V. Ryabov, B.A. Shaybonov, M.D. Shelepov, Fedor Šimkovic, A.E. Sirenko, A.V. Skurikhin, A.G. Solovjev, M.N. Sorokovikov, Ivan Štekl, A.P. Stromakov, E.O. Sushenok, O.V. Suvorova, V.A. Tabolenko, B.A. Tarashansky, Y.V. Yablokova, S.A. Yakovlev, and D.N. Zaborov

Subjects
High Energy Astrophysical Phenomena (astro-ph.HE), Physics, Particle physics, Muon, Physics::Instrumentation and Detectors, Astrophysics::High Energy Astrophysical Phenomena, Track (disk drive), Monte Carlo method, Detector, Astrophysics::Instrumentation and Methods for Astrophysics, FOS: Physical sciences, Classifier (linguistics), High Energy Physics::Experiment, Gradient boosting, Neutrino, Astrophysics - High Energy Astrophysical Phenomena, Astrophysics - Instrumentation and Methods for Astrophysics, Instrumentation and Methods for Astrophysics (astro-ph.IM), Selection (genetic algorithm)
Abstract

Baikal-GVD is a km$^3$-scale neutrino telescope being constructed in Lake Baikal. Muon and partially tau (anti)neutrino interactions near the detector through the W$^{\pm}$-boson exchange are accompanied by muon tracks. Reconstructed direction of the track is arguably the most precise probe of the neutrino direction attainable in Cerenkov neutrino telescopes. Muon reconstruction techniques adopted by Baikal-GVD are discussed in the present report. Performance of the muon reconstruction is studied using realistic Monte Carlo simulation of the detector. The algorithms are applied to real data from Baikal-GVD and the results are compared with simulations. The performance of the neutrino selection based on a boosted decision tree classifier is discussed., 8 pages, 5 figures. Poster presented at 37th International Cosmic Ray Conference (ICRC 2021), July 12th - 23rd, 2021, Online - Berlin, Germany. PoS(ICRC2021)1080

Published
2021
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8. The Baikal-GVD neutrino telescope: search for high-energy cascades

Author

Zhan-Arys Magysovich Dzhilkibaev, V.A. Allakhverdyan, А.D. Avrorin, A.V. Avrorin, V.M. Aynutdinov, R. Bannasch, Z. Bardаčová, I.A. Belolaptikov, I.V. Borina, V.B. Brudanin, N.M. Budnev, V.Y. Dik, G.V. Domogatsky, A.A. Doroshenko, Rastislav Dvornicky, A.N. Dyachok, Zh.-A.M. Dzhilkibaev, Eliška Eckerová, T.V. Elzhov, L. Fajt, Stanislav Vasilevich Fialkovsky, A.R. Gafarov, K.V. Golubkov, N.S. Gorshkov, T.I. Gress, M.S. Katulin, K.G. Kebkal, O.G. Kebkal, E.V. Khramov, M.M. Kolbin, K.V. Konischev, K.A. Kopański, A.V. Korobchenko, A.P. Koshechkin, V.A. Kozhin, M.V. Kruglov, M.K. Kryukov, V.F. Kulepov, Pa. Malecki, Y.M. Malyshkin, M.B. Milenin, R.R. Mirgazov, D.V. Naumov, V. Nazari, W. Noga, D.P. Petukhov, E.N. Pliskovsky, M.I. Rozanov, V.D. Rushay, E.V. Ryabov, G.B. Safronov, B.A. Shaybonov, M.D. Shelepov, Fedor Šimkovic, A.E. Sirenko, A.V. Skurikhin, A.G. Solovjev, M.N. Sorokovikov, Ivan Štekl, A.P. Stromakov, E.O. Sushenok, O.V. Suvorova, V.A. Tabolenko, B.A. Tarashansky, Y.V. Yablokova, S.А. Yakovlev, D.N. Zaborov, Yu.A. Kovalev, Yu.Yu. Kovalev, A.V. Plavin, S.V. Troitsky, A.K. Erkenov, T.V. Mufakharov, Yu.V. Sotnikova, T. Hovatta, S. Kiehlmann, and A.C.S. Readhead

Published
2021
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9. Follow up of the IceCube alerts with the Baikal-GVD telescope

Author

V.Y. Dik, V.A. Allakhverdyan, A.D. Avrorin, A.V. Avrorin, V.M. Aynutdinov, R. Bannasch, Z. Bardačová, I.A. Belolaptikov, I.V. Borina, V.B. Brudanin, N.M. Budnev, G.V. Domogatsky, A.A. Doroshenko, R. Dvornický, A.N. Dyachok, Zh.-A.M. Dzhilkibaev, E. Eckerová, T.V. Elzhov, L. Fajt, S.V. Fialkovski, A.R. Gafarov, K.V. Golubkov, N.S. Gorshkov, T.I. Gress, M.S. Katulin, K.G. Kebkal, O.G. Kebkal, E.V. Khramov, M.M. Kolbin, K.V. Konischev, K.A. Kopański, A.V. Korobchenko, A.P. Koshechkin, V.A. Kozhin, M.V. Kruglov, M.K. Kryukov, V.F. Kulepov, Pa. Malecki, Y.M. Malyshkin, M.B. Milenin, R.R. Mirgazov, D.V. Naumov, V. Nazari, W. Noga, D.P. Petukhov, E.N. Pliskovsky, M.I. Rozanov, V.D. Rushay, E.V. Ryabov, G.B. Safronov, B.A. Shaybonov, M.D. Shelepov, F. Šimkovic, A.E. Sirenko, A.V. Skurikhin, A.G. Solovjev, M.N. Sorokovikov, I. Štekl, A.P. Stromakov, E.O. Sushenok, O.V. Suvorova, V.A. Tabolenko, B.A. Tarashansky, Y.V. Yablokova, S.A. Yakovlev, and D.N. Zaborov

Subjects
High Energy Astrophysical Phenomena (astro-ph.HE), Physics::Instrumentation and Detectors, Astrophysics::High Energy Astrophysical Phenomena, Astrophysics::Instrumentation and Methods for Astrophysics, FOS: Physical sciences, High Energy Physics::Experiment, Astrophysics - High Energy Astrophysical Phenomena, Instrumentation, Mathematical Physics
Abstract

The high-energy muon neutrino events of the IceCube telescope, that are triggered as neutrino alerts in one of two probability ranks of astrophysical origin, "gold" and "bronze", have been followed up by the Baikal-GVD in a fast quasi-online mode since September 2020. Search for correlations between alerts and GVD events reconstructed in two modes, muon-track and cascades (electromagnetic or hadronic showers), for the time windows $ \pm $ 1 h and $ \pm $ 12 h does not indicate statistically significant excess of the measured events over the expected number of background events. Upper limits on the neutrino fluence will be presented for each alert., Comment: 5 pages, 5 figures, Proceedings for the VLVnT 2021 conference, submitted to JINST

Published
2021
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10. Multi-messenger and real-time astrophysics with the Baikal-GVD telescope

Author

K.V. Konischev, K.V. Golubkov, B.A. Tarashansky, Y. V. Yablokova, A. E. Sirenko, V. B. Brudanin, V.F. Kulepov, Z. Bardаčová, V. Nazari, V. Y. Dik, V.D. Rushay, N. M. Budnev, V. A. Allakhverdyan, T. V. Elzhov, Aleksandr Gafarov, R. R. Mirgazov, D. P. Petukhov, A.V. Korobchenko, Mark Shelepov, D. N. Zaborov, A.P. Koshechkin, A.V. Avrorin, A.D. Avrorin, G.B. Safronov, K. A. Kopański, M.V. Kruglov, Fedor Šimkovic, I. Stekl, S.V. Fialkovski, V.A. Tabolenko, Rastislav Dvornický, G.V. Domogatsky, E.N. Pliskovsky, A. A. Doroshenko, E. Eckerová, R. Bannasch, Zh.-A.M. Dzhilkibaev, E. O. Sushenok, Pa. Malecki, Yury Malyshkin, A. P. Stromakov, A. V. Skurikhin, Olga Suvorova, W. Noga, O.G. Kebkal, T. I. Gress, M.I. Rozanov, M.K. Kryukov, A.G. Solovjev, Lukas Fajt, M.N. Sorokovikov, B.A. Shaybonov, A. N. Dyachok, E. V. Ryabov, M.M. Kolbin, M. S. Katulin, V. M. Aynutdinov, Sergey Yakovlev, I. V. Borina, V. A. Kozhin, M.B. Milenin, N.S. Gorshkov, Evgeniy Khramov, I. A. Belolaptikov, Konstantin Kebkal, and Dmitry V. Naumov

Subjects
Physics, High Energy Astrophysical Phenomena (astro-ph.HE), COSMIC cancer database, Physics::Instrumentation and Detectors, Astrophysics::High Energy Astrophysical Phenomena, Astrophysics::Instrumentation and Methods for Astrophysics, FOS: Physical sciences, Celestial sphere, Astrophysics, Magnetar, law.invention, Telescope, Cascade, law, Muon neutrino, High Energy Physics::Experiment, Neutrino, Gamma-ray burst, Astrophysics - High Energy Astrophysical Phenomena
Abstract

The Baikal-GVD deep underwater neutrino experiment participates in the international multi-messenger program on discovering the astrophysical sources of high energy fluxes of cosmic particles, while being at the stage of deployment with a gradual increase of its effective volume to the scale of a cubic kilometer. In April 2021 the effective volume of the detector has been reached 0.4 km3 for cascade events with energy above 100 TeV generated by neutrino interactions in Lake Baikal. The alarm system in real-time monitoring of the celestial sphere was launched at the beginning of 2021, that allows to form the alerts of two ranks like "muon neutrino" and "VHE cascade". Recent results of fast follow-up searches for coincidences of Baikal-GVD high energy cascades with ANTARES/TAToO high energy neutrino alerts and IceCube GCN messages will be presented, as well as preliminary results of searches for high energy neutrinos in coincidence with the magnetar SGR 1935+2154 activity in period of radio and gamma burst in 2020., Comment: Submitted to Proc. of the 37th International Cosmic Ray Conference (ICRC 2021), PoS-0946, July 12th -- 23rd, 2021, Online -- Berlin, Germany. 8 pages, 5 figures

Published
2021
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11. Baikal-GVD: status and first results

Author

Grigory Safronov, A.D. Avrorin, A.V. Avrorin, V.M. Aynutdinov, Z. Bardáčová, R. Bannasch, I.A. Belolaptikov, V.B. Brudanin, N.M. Budnev, G.V. Domogatsky, E. Eckerová, T.V. Elzhov, L. Fajt, S.V. Fialkovski, A.R. Gafarov, K.V. Golubkov, N.S. Gorshkov, T.I. Gress, R.A. Ivanov, M.S. Katulin, K.G. Kebkal, O.G. Kebkal, E.V. Khramov, M.M. Kolbin, K.V. Konischev, K.A. Kopański, A.V. Korobchenko, A.P. Koshechkin, V.A. Kozhin, M.K. Kryukov, M.V. Kruglov, V.F. Kulepov, M.B. Milenin, R.R. Mirgazov, D.V. Naumov, V. Nazari, W. Noga, D.P. Petukhov, E.N. Pliskovsky, M.I. Rozanov, V.D. Rushay, E.V. Ryabov, G.B. Safronov, B.A. Shaybonov, M.D. Shelepov, F. Šimkovic, A.V. Skurikhin, A.G. Solovjev, M.N. Sorokovikov, I. Štekl, E.O. Sushenok, O.V. Suvorova, V.A. Tabolenko, B.A. Tarashansky, Y.V. Yablokova, S. Yakovlev, and D.N. Zaborov𝑎

Published
2020
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12. Technique for suppression of background cascades produced by atmospheric muon bundles in the Baikal-GVD

Author

V.A. Allakhverdyan, A.D. Avrorin, A.V. Avrorin, V.M. Aynutdinov, R. Bannasch, Z. Bardačová, I.A. Belolaptikov, I.V. Borina, V.B. Brudanin, N.M. Budnev, V.Y. Dik, G.V. Domogatsky, A.A. Doroshenko, R. Dvornický, A.N. Dyachok, Zh.-A.M. Dzhilkibaev, E. Eckerová, T.V. Elzhov, L. Fajt, S.V. Fialkovski, A.R. Gafarov, K.V. Golubkov, N.S. Gorshkov, T.I. Gress, M.S. Katulin, K.G. Kebkal, O.G. Kebkal, E.V. Khramov, M.M. Kolbin, K.V. Konischev, K.A. Kopański, A.V. Korobchenko, A.P. Koshechkin, V.A. Kozhin, M.V. Kruglov, M.K. Kryukov, V.F. Kulepov, Pa. Malecki, Y.M. Malyshkin, M.B. Milenin, R.R. Mirgazov, D.V. Naumov, V. Nazari, W. Noga, D.P. Petukhov, E.N. Pliskovsky, M.I. Rozanov, V.D. Rushay, E.V. Ryabov, G.B. Safronov, B.A. Shaybonov, M.D. Shelepov, F. Šimkovic, A.E. Sirenko, A.V. Skurikhin, A.G. Solovjev, M.N. Sorokovikov, I. Štekl, A.P. Stromakov, E.O. Sushenok, O.V. Suvorova, V.A. Tabolenko, B.A. Tarashansky, Y.V. Yablokova, S.A. Yakovlev, and D.N. Zaborov

Subjects
Physics::Instrumentation and Detectors, Instrumentation, Mathematical Physics
Abstract

Baikal-GVD (Gigaton Volume Detector) is a neutrino telescope located in pure water of Lake Baikal. At the current stage (season 2021), detector is composed of 2304 optical modules arranged in 8 clusters. In searching for neutrino cascade events, light patterns produced via discrete stochastic energy losses along muon tracks create the most abundant background. Methods to separate cascade-like events from tracks and neutrino cascades in a single cluster have been developed and optimized. One of the method tries to find the maximum number of track hits amongst cascade hits, which are present in the muon bundle event. Other ones rely on the distributions of charges and positions of hits on optical modules associated with cascade events. All suppression methods were optimized by the Monte Carlo simulation datasets.

Published
2022
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13. Method and portable bench for tests of the laser optical calibration system components for the Baikal-GVD underwater neutrino Cherenkov telescope

Author

V.A. Allakhverdyan, A.D. Avrorin, A.V. Avrorin, V.M. Aynutdinov, R. Bannasch, Z. Bardačová, I.A. Belolaptikov, I.V. Borina, V.B. Brudanin, N.M. Budnev, V.Y. Dik, G.V. Domogatsky, A.A. Doroshenko, R. Dvornický, A.N. Dyachok, Zh.-A.M. Dzhilkibaev, E. Eckerová, T.V. Elzhov, L. Fajt, S.V. Fialkovski, A.R. Gafarov, K.V. Golubkov, N.S. Gorshkov, T.I. Gress, M.S. Katulin, K.G. Kebkal, O.G. Kebkal, E.V. Khramov, M.M. Kolbin, K.V. Konischev, K.A. Kopański, A.V. Korobchenko, A.P. Koshechkin, V.A. Kozhin, M.V. Kruglov, M.K. Kryukov, V.F. Kulepov, Pa. Malecki, Y.M. Malyshkin, M.B. Milenin, R.R. Mirgazov, D.V. Naumov, V. Nazari, W. Noga, D.P. Petukhov, E.N. Pliskovsky, M.I. Rozanov, V.D. Rushay, E.V. Ryabov, G.B. Safronov, B.A. Shaybonov, M.D. Shelepov, F. Šimkovic, A.E. Sirenko, A.V. Skurikhin, A.G. Solovjev, M.N. Sorokovikov, I. Štekl, A.P. Stromakov, E.O. Sushenok, O.V. Suvorova, V.A. Tabolenko, B.A. Tarashansky, Y.V. Yablokova, S.A. Yakovlev, and D.N. Zaborov

Subjects
Physics - Instrumentation and Detectors, Astrophysics::High Energy Astrophysical Phenomena, Astrophysics::Instrumentation and Methods for Astrophysics, FOS: Physical sciences, Instrumentation and Detectors (physics.ins-det), Astrophysics - Instrumentation and Methods for Astrophysics, Instrumentation and Methods for Astrophysics (astro-ph.IM), Instrumentation, Mathematical Physics
Abstract

The large-scale deep underwater Cherenkov neutrino telescopes like Baikal-GVD, ANTARES or KM3NeT, require calibration and testing methods of their optical modules. These methods usually include laser-based systems which allow to check the telescope responses to the light and for real-time monitoring of the optical parameters of water such as absorption and scattering lengths, which show seasonal changes in natural reservoirs of water. We will present a testing method of a laser calibration system and a set of dedicated tools developed for Baikal- GVD, which includes a specially designed and built, compact, portable, and reconfigurable scanning station. This station is adapted to perform fast quality tests of the underwater laser sets just before their deployment in the telescope structure, even on ice, without darkroom. The testing procedure includes the energy stability test of the laser device, 3D scan of the light emission from the diffuser and attenuation test of the optical elements of the laser calibration system. The test bench consists primarily of an automatic mechanical scanner with a movable Si detector, beam splitter with a reference Si detector and, optionally, Q-switched diode-pumped solid-state laser used for laboratory scans of the diffusers. The presented test bench enables a three-dimensional scan of the light emission from diffusers, which are designed to obtain the isotropic distribution of photons around the point of emission. The results of the measurement can be easily shown on a 3D plot immediately after the test and may be also implemented to a dedicated program simulating photons propagation in water, which allows to check the quality of the diffuser in the scale of the Baikal-GVD telescope geometry., Comment: Presented at the VLVnT - Very Large Volume Neutrino Telescope Workshop, Valencia, 18-21 May 2021

Published
2021
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14. Luminescence of Baikal water as a dynamic background of the Baikal-GVD Neutrino Telescope

Author

V.A. Allakhverdyan, A.D. Avrorin, A.V. Avrorin, V.M. Aynutdinov, R. Bannasch, Z. Bardačová, I.A. Belolaptikov, I.V. Borina, V.B. Brudanin, N.M. Budnev, V.Y. Dik, G.V. Domogatsky, A.A. Doroshenko, R. Dvornický, A.N. Dyachok, Zh.-A.M. Dzhilkibaev, E. Eckerová, T.V. Elzhov, L. Fajt, S.V. Fialkovski, A.R. Gafarov, K.V. Golubkov, N.S. Gorshkov, T.I. Gress, M.S. Katulin, K.G. Kebkal, O.G. Kebkal, E.V. Khramov, M.M. Kolbin, K.V. Konischev, K.A. Kopański, A.V. Korobchenko, A.P. Koshechkin, V.A. Kozhin, M.V. Kruglov, M.K. Kryukov, V.F. Kulepov, Pa. Malecki, Y.M. Malyshkin, M.B. Milenin, R.R. Mirgazov, D.V. Naumov, V. Nazari, W. Noga, D.P. Petukhov, E.N. Pliskovsky, M.I. Rozanov, V.D. Rushay, E.V. Ryabov, G.B. Safronov, B.A. Shaybonov, M.D. Shelepov, F. Šimkovic, A.E. Sirenko, A.V. Skurikhin, A.G. Solovjev, M.N. Sorokovikov, I. Štekl, A.P. Stromakov, E.O. Sushenok, O.V. Suvorova, V.A. Tabolenko, B.A. Tarashansky, Y.V. Yablokova, S.A. Yakovlev, and D.N. Zaborov

Subjects
Instrumentation, Mathematical Physics
Abstract

The Baikal-GVD is a neutrino telescope situated in the deepest freshwater lake in the world — Lake Baikal. The design of the Baikal-GVD trigger system allows also to study the ambient light of the lake. The analysis of the optical light activity of Baikal water, particularly, time and spatial variations of the luminescence activity for data collected in years 2018, 2019, and 2020 is presented. For the first time we observed highly luminescent layer moving upwards with maximal speed of 28 m/day in January 2021.

Published
2021
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15. Time synchronization system of Baikal-GVD

Author

T. I. Gress, A.V. Avrorin, Lukas Fajt, V. M. Aynutdinov, Sergey Yakovlev, E. V. Ryabov, M.M. Kolbin, Aleksandr Gafarov, M.N. Sorokovikov, T. V. Elzhov, O.G. Kebkal, R. R. Mirgazov, R. Bannasch, M.I. Rozanov, Z. Bardačová, Mark Shelepov, S.V. Fialkovsky, A. P. Stromakov, E. O. Sushenok, Dmitry V. Naumov, V. B. Brudanin, V.F. Kulepov, A.G. Solovjev, Evgeniy Khramov, Pa. Malecki, A. V. Skurikhin, A. A. Doroshenko, I. A. Belolaptikov, Konstantin Kebkal, I. Stekl, V.A. Tabolenko, Zh.-A.M. Dzhilkibaev, V. Y. Dik, W. Noga, Y. V. Yablokova, V.D. Rushay, V. A. Allakhverdyan, N.S. Gorshkov, Yury Malyshkin, B.A. Tarashansky, N. M. Budnev, K.V. Golubkov, D. P. Petukhov, A. E. Sirenko, K. A. Kopański, E.N. Pliskovsky, A.D. Avrorin, G.B. Safronov, G.V. Domogatsky, M. S. Katulin, M.V. Kruglov, Rastislav Dvornický, A.V. Korobchenko, Fedor Šimkovic, V. A. Kozhin, M.B. Milenin, K.V. Konischev, I. V. Borina, D. N. Zaborov, A.P. Koshechkin, V. Nazari, B.A. Shaybonov, A. N. Dyachok, E. Eckerová, Olga Suvorova, and M.K. Kryukov

Subjects
Physics, Neutrino detector, Electronic engineering, Instrumentation, Mathematical Physics, Time synchronization
Published
2021
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16. The optical noise monitoring systems of the Lake Baikal environment for the Baikal-GVD telescope

Author

T. I. Gress, V. B. Brudanin, V.F. Kulepov, K.V. Golubkov, Lukas Fajt, Evgeniy Khramov, I. A. Belolaptikov, A. V. Skurikhin, M.N. Sorokovikov, A.V. Avrorin, Konstantin Kebkal, M.M. Kolbin, B.A. Tarashansky, Evgenii V Rjabov, A.D. Avrorin, A.P. Koshechkin, G.V. Domogatsky, V.D. Rushay, V. M. Aynutdinov, M.V. Kruglov, Sergey Yakovlev, K.V. Konischev, A. A. Doroshenko, Zh.-A.M. Dzhilkibaev, M.B. Milenin, R. Bannash, Fedor Šimkovic, I. Stekl, R. Ivanov, V.A. Tabolenko, V. Nazari, E.N. Pliskovsky, B.A. Shaybonov, A. N. Dyachok, N.S. Gorshkov, A.V. Kozhin, Olga Suvorova, G.B. Safronov, Rastislav Dvornický, M.K. Kryukov, S.V. Fialkovsky, E. O. Sushenok, Mark Shelepov, N. M. Budnev, D. P. Petukhov, A.V. Korobchenko, A. I. Panfilov, O.G. Kebkal, M.I. Rozanov, A.G. Solovjev, R. R. Mirgazov, and Aleksandr Gafarov

Subjects
Physics, Telescope, Optics, law, business.industry, Neutrino telescope, Cluster (physics), Optical noise, Monitoring system, Luminescence, business, Light field, law.invention
Abstract

We present data on the luminescence of the Baikal water medium collected with the Baikal-GVD neutrino telescope. This three-dimensional array of light sensors allows the observation of time and spatial variations of the ambient light field. We report on observation of an increase of luminescence activity in 2016 and 2018. On the contrary, we observed practically constant optical noise in 2017. An agreement has been found between two independent optical noise data sets. These are data collected with online monitoring system and the trigger system of the cluster.

Published
2019
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17. The Baikal-GVD neutrino telescope: First results of multi-messenger study

Author

R. R. Mirgazov, A.V. Avrorin, T. I. Gress, Lukas Fajt, B.A. Tarashansky, M.M. Kolbin, G.B. Safronov, M.V. Kruglov, Rastislav Dvornický, Fedor Šimkovic, K.V. Golubkov, Aleksandr Gafarov, M.N. Sorokovikov, S.V. Fialkovsky, E. O. Sushenok, V. M. Aynutdinov, A.D. Avrorin, A.V. Korobchenko, Sergey Yakovlev, Evgeniy Khramov, Mark Shelepov, I. A. Belolaptikov, Konstantin Kebkal, V. B. Brudanin, V.F. Kulepov, A. V. Skurikhin, G.V. Domogatsky, N.S. Gorshkov, Zhan-Arys Magysovich Dzhilkibaev, V.D. Rushay, M.B. Milenin, Evgenii V Rjabov, E.N. Pliskovsky, A. I. Panfilov, O.G. Kebkal, M.I. Rozanov, R. Bannash, A.G. Solovjev, V. Nazari, N. M. Budnev, I. Stekl, D. P. Petukhov, R. Ivanov, V.A. Tabolenko, A.P. Koshechkin, A. A. Doroshenko, K.V. Konischev, B.A. Shaybonov, A. N. Dyachok, A.V. Kozhin, Olga Suvorova, and M.K. Kryukov

Subjects
Physics, Physics::Instrumentation and Detectors, Gravitational wave, Astrophysics::High Energy Astrophysical Phenomena, media_common.quotation_subject, Astrophysics::Instrumentation and Methods for Astrophysics, Cosmic ray, Astrophysics, Coincidence, Universe, law.invention, Telescope, Neutrino detector, law, High Energy Physics::Experiment, Neutrino, Zenith, media_common
Abstract

Multi-messenger astronomy is a powerful tool to study the physical processes driving the non-thermal Universe. A combination of observations in cosmic rays, neutrinos, photons of all wavelengths and gravitational waves is expected. The alert system of the Baikal-GVD detector under construction will allow for a fast, on-line reconstruction of neutrino events recorded by the Baikal-GVD telescope and - if predefined conditions are satisfied - for the formation of an alert message to other communities. The preliminary results of searches for high-energy neutrinos in coincidence with GW170817/GRB170817A using the cascade mode of neutrino detection are discussed. Two Baikal-GVD clusters were operating during 2017. The zenith angle of NGC 4993 at the detection time of the GW170817 was 93.3 degrees. No events spatially coincident with GRB170817A were found. Given the non-detection of neutrino events associated with GW170817, upper limits on the neutrino fluence were established.

Published
2019
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18. Time calibration of the neutrino telescope Baikal-GVD

Author

K.V. Konischev, I. Shtekl, B.A. Tarashansky, A.D. Avrorin, M.N. Sorokovikov, B. A. Shaibonov, Mark Shelepov, G.B. Safronov, A.V. Avrorin, A. N. Dyachok, D.A. Kuleshov, Rastislav Dvornický, A. A. Doroshenko, G.V. Domogatsky, E.V. Khramov, V.B. Brudanin, Zh.-A.M. Dzhilkibaev, K.V. Golubkov, Olga Suvorova, N. M. Budnev, D. P. Petukhov, Sergey Yakovlev, N.S. Gorshkov, V.D. Rushay, V.M. Aynutdinov, M.K. Kryukov, A.P. Koshechkin, V. A. Kozhin, Fedor Šimkovic, M.V. Kruglov, A. I. Panfilov, Lukas Fajt, O.G. Kebkal, M.I. Rozanov, M.M. Kolbin, M.B. Milenin, R. R. Mirgazov, A.G. Solovjev, S.V. Fialkovsky, R. Bannash, V.A. Tabolenko, V. Nazari, T.I. Gres, E.N. Pliskovsky, A.P. Korobchenko, Evgenii V Rjabov, I. A. Belolaptikov, Konstantin Kebkal, Aleksandr Gafarov, A. V. Zagorodnikov, and V.F. Kulepov

Subjects
Physics, 010308 nuclear & particles physics, Physics::Instrumentation and Detectors, Astrophysics::High Energy Astrophysical Phenomena, QC1-999, Detector, Neutrino telescope, Astrophysics::Instrumentation and Methods for Astrophysics, Scale (descriptive set theory), 01 natural sciences, Position (vector), 0103 physical sciences, Calibration, Cluster (physics), 010306 general physics, Nonlinear Sciences::Pattern Formation and Solitons, Energy (signal processing), Remote sensing
Abstract

Baikal-GVD is a cubic-kilometer scale neutrino telescope, which is currently under construction in Lake Baikal. Baikal-GVD is an array of optical modules arranged in clusters. The first cluster of the array has been deployed and commissioned in April 2015. To date, Baikal-GVD consists of 3 clusters with 864 optical modules. One of the vital conditions for optimal energy, position and direction reconstruction of the detected particles is the time calibration of the detector. In this article, we describe calibration equipment and methods used in Baikal-GVD and demonstrate the accuracy of the calibration procedures.

Published
2019

19. Baikal-GVD: cascades

Author

A.P. Koshechkin, A. I. Panfilov, O.G. Kebkal, M.I. Rozanov, V.D. Rushay, Olga Suvorova, R. R. Mirgazov, A.G. Solovjev, V.M. Aynutdinov, Mark Shelepov, D. P. Petukhov, G.V. Domogatsky, A.P. Korobchenko, E.N. Pliskovsky, M.N. Sorokovikov, B.A. Tarashansky, M.K. Kryukov, N. M. Budnev, B. A. Shaibonov, V. A. Kozhin, S.V. Fialkovsky, K.V. Konischev, A.D. Avrorin, Evgenii V Rjabov, A. A. Doroshenko, K.V. Golubkov, V.F. Kulepov, Zh.-A.M. Dzhilkibaev, E.V. Khramov, V. Nazari, A.V. Avrorin, D.A. Kuleshov, A. N. Dyachok, Aleksandr Gafarov, N.S. Gorshkov, M.B. Milenin, A. V. Zagorodnikov, Sergey Yakovlev, Lukas Fajt, R. Bannash, T.I. Gres, G.B. Safronov, Rastislav Dvornický, M.M. Kolbin, I. Shtekl, Fedor Šimkovic, V.A. Tabolenko, V.B. Brudanin, I. A. Belolaptikov, Konstantin Kebkal, and M.V. Kruglov

Subjects
Physics, 010308 nuclear & particles physics, Physics::Instrumentation and Detectors, Astrophysics::High Energy Astrophysical Phenomena, QC1-999, Neutrino telescope, High Energy Physics::Phenomenology, Mode (statistics), Astrophysics::Instrumentation and Methods for Astrophysics, 01 natural sciences, Nuclear physics, Cascade, 0103 physical sciences, High Energy Physics::Experiment, Neutrino, 010306 general physics
Abstract

Baikal-GVD is a next generation, kilometer-scale neutrino telescope currently under construction in Lake Baikal. GVD is formed by multi-megaton subarrays (clusters) and is designed for the detection of astrophysical neutrino fluxes at energies from a few TeV up to 100 PeV. The design of Baikal-GVD allows one to search for astrophysical neutrinos with flux values measured by IceCube already at early phases of the array construction. We present here preliminary results of the search for high-energy neutrinos via the cascade mode obtained in 2015 and 2016.

Published
2019

20. Environmental studies in Lake Baikal: basic facts and perspectives for interdisciplinary research

Author

M.N. Sorokovikov, Evgenii V Rjabov, B. A. Shaibonov, R. Bannash, S.V. Fialkovsky, K.V. Konischev, T.I. Gres, M.V. Kruglov, V.A. Tabolenko, N.S. Gorshkov, E. O. Kiktenko, A.V. Avrorin, M.B. Milenin, E.S. Troitskaya, B.A. Tarashansky, V.F. Kulepov, E.N. Pliskovsky, A.D. Avrorin, V.B. Brudanin, G.V. Domogatsky, Mark Shelepov, N. M. Budnev, I. A. Belolaptikov, R. R. Mirgazov, A.P. Koshechkin, Konstantin Kebkal, M. Sturm, D. P. Petukhov, E.V. Khramov, I.A. Portyanskaya, K.V. Golubkov, A.P. Korobchenko, S.V. Lovtsov, V. Nazari, A. A. Doroshenko, Zh.-A.M. Dzhilkibaev, V. M. Aynutdinov, I. Shtekl, V. A. Kozhin, Sergey Yakovlev, A. I. Panfilov, O.G. Kebkal, M.I. Rozanov, V.D. Rushay, Aleksandr Gafarov, V.O. Serdyuk, A. V. Zagorodnikov, A.G. Solovjev, D.A. Kuleshov, Lukas Fajt, M.M. Kolbin, Fedor Šimkovic, Olga Suvorova, M.K. Kryukov, A. N. Dyachok, S.M. Korotaev, G.B. Safronov, and Rastislav Dvornický

Subjects
010504 meteorology & atmospheric sciences, Earth science, Physics, QC1-999, Neutrino telescope, 01 natural sciences, Deep water, Environmental studies, Neutrino detector, 0103 physical sciences, Underwater, Neutrino, Endemism, 010303 astronomy & astrophysics, Surface water, 0105 earth and related environmental sciences
Abstract

Lake Baikal in Siberia is one of the most interesting lakes in the world. It is the world’s largest reservoir of fresh surface water and home to several hundred endemic species. At the same time it harboured the first underwater neutrino telescope NT200, now followed by its successor Baikal-GVD, a cubic-kilometre scale neutrino telescope. Within the Baikal Neutrino project a number of methods and instruments have been designed to study various processes in the Baikal ecosystem. Hundreds of optical, acoustic and other sensors allow for long-term 3D monitoring of water parameters like temperature, inherent optical properties or the intensity of water luminescence, as well as processes like sedimentation or deep water renewal. Here we present selected results of the interdisciplinary environmental studies.

Published
2019

21. Spatial positioning of underwater components for Baikal- GVD

Author

Aleksandr Gafarov, A. V. Zagorodnikov, R. R. Mirgazov, Mark Shelepov, E.N. Pliskovsky, A.V. Skurichin, T.I. Gres, K.V. Golubkov, K.V. Konischev, R. Bannash, B.A. Shaybonov, V.F. Kulepov, D. P. Petukhov, Evgenii V Rjabov, A. N. Dyachok, A.D. Avrorin, V. A. Kozhin, V.A. Tabolenko, I. Shtekl, M.V. Kruglov, I. A. Belolaptikov, Konstantin Kebkal, Olga Suvorova, A.V. Avrorin, V.D. Rushay, S.V. Fialkovsky, V.M. Aynutdinov, M.N. Sorokovikov, M.K. Kryukov, V.B. Brudanin, A. I. Panfilov, B.A. Tarashansky, Lukas Fajt, A. A. Doroshenko, O.G. Kebkal, M.B. Milenin, M.I. Rozanov, M.M. Kolbin, A.V. Korobchenko, Zh.-A.M. Dzhilkibaev, V. Nazari, G.V. Domogatsky, A.G. Solovjev, G.B. Safronov, Rastislav Dvornický, N.S. Gorshkov, A.P. Koshechkin, E.V. Khramov, Sergey Yakovlev, Fedor Šimkovic, N. M. Budnev, and D.A. Kuleshov

Subjects
Spatial positioning, Positioning system, Physics::Instrumentation and Detectors, 010308 nuclear & particles physics, Orientation (computer vision), Astrophysics::High Energy Astrophysical Phenomena, Physics, QC1-999, Detector, Neutrino telescope, Astrophysics::Instrumentation and Methods for Astrophysics, Geodesy, 01 natural sciences, Acceleration, Timing error, 0103 physical sciences, Underwater, 010306 general physics
Abstract

Baikal-GVD is a cubic kilometer-scale neutrino telescope currently under construction in Lake Baikal. The detector’s components are mobile and may drift from their initial coordinates or change their spatial orientation. This introduces a reconstruction error, particularly a timing error for PMT hits. This problem is mitigated by a combination of a hydroacoustic positioning system and per-component acceleration and orientation sensors. Under regular conditions, the average positioning accuracy for a GVD component is estimated to be less than 13 cm.

Published
2019
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22. Luminescence of water in Lake Baikal observed with the Baikal-GVD neutrino telescope

Author

V.F. Kulepov, R. Bannash, Aleksandr Gafarov, T. I. Gress, I. Stekl, V.A. Tabolenko, A. V. Zagorodnikov, Lukas Fajt, Evgenii V Rjabov, A.V. Avrorin, B.A. Tarashansky, E.V. Khramov, M.M. Kolbin, A.V. Korobchenko, V. M. Aynutdinov, Sergey Yakovlev, D.A. Kuleshov, M.V. Kruglov, V.D. Rushay, A.D. Avrorin, V. Nazari, I. A. Belolaptikov, Konstantin Kebkal, R. R. Mirgazov, K.V. Golubkov, G.V. Domogatsky, M.N. Sorokovikov, A. A. Doroshenko, Zh.-A.M. Dzhilkibaev, Fedor Šimkovic, K.V. Konischev, A.P. Koshechkin, M.B. Milenin, V. A. Kozhin, B.A. Shaybonov, A. N. Dyachok, G.B. Safronov, Rastislav Dvornický, A. I. Panfilov, Olga Suvorova, O.G. Kebkal, M.I. Rozanov, S.V. Fialkovsky, M.K. Kryukov, A.G. Solovjev, N.S. Gorshkov, E.N. Pliskovsky, N. M. Budnev, D. P. Petukhov, Mark Shelepov, and V. B. Brudanin

Subjects
Physics, Physics::Instrumentation and Detectors, 010308 nuclear & particles physics, Astrophysics::High Energy Astrophysical Phenomena, QC1-999, Neutrino telescope, Astrophysics::Instrumentation and Methods for Astrophysics, Astronomy, 01 natural sciences, 0103 physical sciences, 010306 general physics, Luminescence, Light field
Abstract

We present data on the luminescence of the Baikal water medium collected with the Baikal-GVD neutrino telescope. This three-dimensional array of light sensors allows the observation of time and spatial variations of the ambient light field. In 2016, we observed a maximum of luminescence activity between July and October.

Published
2019
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23. Status of the Baikal-GVD Neutrino Telescope

Author

N. M. Budnev, A.V. Korobchenko, M.B. Milenin, A.V. Avrorin, Mark Shelepov, K.V. Konischev, R. Bannash, Lukas Fajt, V. A. Kozhin, A.V. Skurichin, M.M. Kolbin, B.A. Tarashansky, M.N. Sorokovikov, A. A. Doroshenko, D.A. Kuleshov, V.F. Kulepov, V.A. Tabolenko, E.V. Khramov, A. I. Panfilov, V.B. Brudanin, Zh.-A.M. Dzhilkibaev, R. R. Mirgazov, T.I. Gres, B.A. Shaybonov, A.P. Koshechkin, S.V. Fialkovsky, O.G. Kebkal, M.I. Rozanov, Fedor Šimkovic, V.D. Rushay, A. N. Dyachok, Sergey Yakovlev, K.V. Golubkov, V.M. Aynutdinov, V. Nazari, A.G. Solovjev, E.N. Pliskovsky, M.V. Kruglov, G.V. Domogatsky, D. P. Petukhov, Olga Suvorova, M.K. Kryukov, Aleksandr Gafarov, A. V. Zagorodnikov, I. Shtekl, A.D. Avrorin, G.B. Safronov, Rastislav Dvornický, I. A. Belolaptikov, Konstantin Kebkal, N.S. Gorshkov, and Evgenii V Rjabov

Subjects
Physics, Scale (ratio), Physics::Instrumentation and Detectors, 010308 nuclear & particles physics, Cherenkov detector, QC1-999, Astrophysics::High Energy Astrophysical Phenomena, Detector, Neutrino telescope, Astrophysics::Instrumentation and Methods for Astrophysics, Astronomy, 01 natural sciences, law.invention, law, 0103 physical sciences, High Energy Physics::Experiment, Underwater, 010306 general physics
Abstract

Currently in Lake Baikal a new-generation neutrino telescope is being deployed: Baikal-GVD, a deep underwater Cherenkov detector on the cubic-kilometer scale. This paper presents the status of the detector implementation and the first physical results obtained with the existing configuration.

Published
2019
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25. Search for cascade events with Baikal-GVD

Author

Zhan-Arys Magysovich Dzhilkibaev, G.V. Domogatsky, R. R. Mirgazov, N. M. Budnev, A. I. Panfilov, A.V. Korobchenko, O.G. Kebkal, M.I. Rozanov, Ivan Štekl, V. Nazari, I. A. Belolaptikov, B.A. Shaybonov, A.G. Solovjev, A. N. Dyachok, A. A. Doroshenko, Konstantin Kebkal, Evgeny V. Khramov, A.V. Kozhin, A. V. Skurikhin, Olga Suvorova, V.B. Brudanin, G.B. Safronov, M.K. Kryukov, M.B. Milenin, Rastislav Dvornický, K.V. Konischev, K.V. Golubkov, D. P. Petukhov, Sergey Yakovlev, A.D. Avrorin, E.N. Pliskovsky, Evgenii V Rjabov, S.V. Fialkovsky, E. O. Sushenok, R. Bannash, V.D. Rushay, V.M. Aynutdinov, T. I. Gress, Lukas Fajt, A.P. Koshechkin, M.M. Kolbin, B.A. Tarashansky, R. Ivanov, V.A. Tabolenko, N.S. Gorshkov, Aleksandr Gafarov, V.F. Kulepov, M.N. Sorokovikov, M.V. Kruglov, A.V. Avrorin, Fedor Šimkovic, and Mark Shelepov

Subjects
Physics, Physics::Instrumentation and Detectors, Cascade, Astrophysics::High Energy Astrophysical Phenomena, Neutrino telescope, Astrophysics::Instrumentation and Methods for Astrophysics, Mode (statistics), High Energy Physics::Experiment, Astrophysics, Neutrino, Nonlinear Sciences::Pattern Formation and Solitons
Abstract

Baikal-GVD is a next generation, kilometer-scale neutrino telescope currently under construction in Lake Baikal. GVD is formed by multi-megaton subarrays (clusters) and is designed for the detection of astrophysical neutrino fluxes at energies from a few TeV up to 100 PeV. The design of Baikal-GVD allows one to search for astrophysical neutrinos with flux values measured by IceCube already at early phases of the array construction. We present here preliminary results of the search for high-energy neutrinos via the cascade mode with the Baikal-GVD neutrino telescope.

26. Neutrino Telescope in Lake Baikal: Present and Future

Author

M.N. Sorokovikov, M.B. Milenin, N. M. Budnev, A.V. Korobchenko, Evgenii V Rjabov, Mark Shelepov, A. V. Skurikhin, V.B. Brudanin, A.V. Avrorin, N.S. Gorshkov, M.V. Kruglov, V.F. Kulepov, R. R. Mirgazov, G.B. Safronov, Rastislav Dvornický, V. M. Aynutdinov, K.V. Golubkov, T. I. Gress, Sergey Yakovlev, Aleksandr Gafarov, Lukas Fajt, S.V. Fialkovsky, E. O. Sushenok, B.A. Tarashansky, M.M. Kolbin, A.D. Avrorin, G.V. Domogatsky, V.D. Rushay, I. A. Belolaptikov, Konstantin Kebkal, K.V. Konischev, V. Nazari, E.N. Pliskovsky, A.P. Koshechkin, D. P. Petukhov, A. A. Doroshenko, Zh.-A.M. Dzhilkibaev, A. I. Panfilov, O.G. Kebkal, M.I. Rozanov, A.G. Solovjev, B.A. Shaybonov, A. N. Dyachok, R. Bannash, Evgeny V. Khramov, I. Stekl, R. Ivanov, V.A. Tabolenko, A.V. Kozhin, Olga Suvorova, M.K. Kryukov, and Fedor Šimkovic

Subjects
Physics, COSMIC cancer database, Physics::Instrumentation and Detectors, Gravitational wave, Astrophysics::High Energy Astrophysical Phenomena, Neutrino telescope, Astrophysics::Instrumentation and Methods for Astrophysics, Northern Hemisphere, Astronomy, Physics::Geophysics, Relativistic particle, High Energy Physics::Experiment, Neutrino, Effective volume
Abstract

A significant progress in the construction and operation of the Baikal Gigaton Volume Detector in Lake Baikal, the largest and deepest freshwater lake in the world, is reported. The effective volume of the detector for neutrino initiated cascades of relativistic particles with energy above 100 TeV has been increased up to about 0.25 km3. This unique scientific facility, the largest operating neutrino telescope in Northern Hemisphere, allows already to register two to three events per year from astrophysical neutrinos with energies exceeding 100 TeV. Preliminary results obtained with data recorded in 2016-2018 are announced. Multimessenger approach is used to relate finding of cosmic neutrinos with those of classical astronomers, with X-ray or gamma-ray observations and the gravitational wave events.

27. A positioning system for Baikal-GVD

Author

A.V. Avrorin, A.V. Korobchenko, Mark Shelepov, Zhan-Arys Magysovich Dzhilkibaev, B.A. Shaybonov, A.P. Koshechkin, G.B. Safronov, A. N. Dyachok, Rastislav Dvornický, M.V. Kruglov, A. I. Panfilov, Evgeny V. Khramov, R. R. Mirgazov, O.G. Kebkal, A.V. Kozhin, R. Bannash, K.V. Golubkov, Olga Suvorova, M.I. Rozanov, V.F. Kulepov, Evgenii V Rjabov, A.G. Solovjev, B.A. Tarashansky, A. V. Skurikhin, N.S. Gorshkov, V. M. Aynutdinov, E.N. Pliskovsky, Sergey Yakovlev, N. M. Budnev, I. Stekl, R. Ivanov, V.A. Tabolenko, M.K. Kryukov, Aleksandr Gafarov, K.V. Konischev, D. P. Petukhov, T. I. Gress, A. A. Doroshenko, Lukas Fajt, M.N. Sorokovikov, M.M. Kolbin, M.B. Milenin, S.V. Fialkovsky, E. O. Sushenok, V.D. Rushay, V.B. Brudanin, I. A. Belolaptikov, V. Nazari, Konstantin Kebkal, A.D. Avrorin, G.V. Domogatsky, and Fedor Šimkovic

Subjects
Spatial positioning, Timing error, Positioning system, Physics::Instrumentation and Detectors, Astrophysics::High Energy Astrophysical Phenomena, Detector, Neutrino telescope, Astrophysics::Instrumentation and Methods for Astrophysics, Photodetector, Neutrino, Geology, Cherenkov radiation, Remote sensing
Abstract

A cubic kilometer scale neutrino telescope Baikal-GVD is currently under construction in Lake Baikal. Baikal-GVD is designed to detect Cerenkov radiation from products of astrophysical neutrino interactions with Baikal water by a lattice of photodetectors submerged between the depths of 1275 and 730 m. The detector components are mounted on flexible strings and can drift from their initial positions upwards to tens of meters. This introduces positioning uncertainty which translates into a timing error for Cerenkov signal registration. A spatial positioning system has been developed to resolve this issue. In this contribution, we present the status of this system, results of acoustic measurements and an estimate of positioning error for an individual component.

28. The Baikal-GVD detector calibrations

Author

A.P. Koshechkin, V. Nazari, K.V. Konischev, Mark Shelepov, Evgeniy Khramov, I. A. Belolaptikov, Konstantin Kebkal, N. M. Budnev, A.V. Avrorin, M.B. Milenin, M.N. Sorokovikov, B.A. Shaybonov, A. N. Dyachok, B.A. Tarashansky, D. P. Petukhov, Evgenii V Rjabov, K.V. Golubkov, R. Bannash, A. V. Skurikhin, I. Stekl, R. Ivanov, V.A. Tabolenko, A.V. Korobchenko, A.D. Avrorin, A.V. Kozhin, G.V. Domogatsky, E.N. Pliskovsky, Olga Suvorova, Aleksandr Gafarov, A. A. Doroshenko, R. R. Mirgazov, V. M. Aynutdinov, Zh.-A.M. Dzhilkibaev, Sergey Yakovlev, M.K. Kryukov, N.S. Gorshkov, V.D. Rushay, A. I. Panfilov, V. B. Brudanin, T. I. Gress, O.G. Kebkal, V.F. Kulepov, M.I. Rozanov, Lukas Fajt, Fedor Šimkovic, A.G. Solovjev, M.M. Kolbin, G.B. Safronov, Rastislav Dvornický, M.V. Kruglov, S.V. Fialkovsky, and E. O. Sushenok

Subjects
Detector, Neutrino telescope, Calibration, Volume (computing), Environmental science, Remote sensing
Abstract

In April 2019, the Baikal-GVD collaboration finished the installation of the fourth and fifth clusters of the neutrino telescope Baikal-GVD. Momentarily, 1440 Optical Modules (OM) are installed in the largest and deepest freshwater lake in the world, Lake Baikal, instrumenting 0.25 km3 of sensitive volume. The Baikal-GVD is thus the largest neutrino telescope on the Northern Hemisphere. The first phase of the detector construction is going to be finished in 2021 with 9 clusters, 2592 OMs in total, however the already installed clusters are stand-alone units which are independently operational and taking data from their commissioning. Huge number of channels as well as strict requirements for the precision of the time and charge calibration (ns, p.e.) make calibration procedures vital and very complex tasks. The inter cluster time calibration is performed with numerous calibration systems. The charge calibration is carried out with a Single Photo-Electron peak. The various data acquired during the last three years in regular and special calibration runs validate successful performance of the calibration systems and of the developed calibration techniques. The precision of the charge calibration has been improved and the time dependence of the obtained calibration parameters have been cross-checked. The multiple calibration sources verified a 1.5 - 2.0 ns precision of the in-situ time calibrations. The time walk effect has been studied in detail with in situ specialized calibration runs.

29. Data quality monitoring system in the Baikal-GVD experiment

Author

Aleksandr Gafarov, D. P. Petukhov, A.V. Kozhin, Olga Suvorova, Evgenii V Rjabov, V.D. Rushay, K.V. Golubkov, E.N. Pliskovsky, N. M. Budnev, R. R. Mirgazov, M.K. Kryukov, V.F. Kulepov, A.P. Koshechkin, T. I. Gress, I. A. Belolaptikov, Konstantin Kebkal, B.A. Shaybonov, B.A. Tarashansky, A.V. Korobchenko, Mark Shelepov, Lukas Fajt, A. N. Dyachok, R. Bannash, M.V. Kruglov, Evgeny V. Khramov, K.V. Konischev, V.B. Brudanin, A. I. Panfilov, O.G. Kebkal, M.M. Kolbin, A. A. Doroshenko, A.D. Avrorin, M.I. Rozanov, I. Stekl, R. Ivanov, Zh.-A.M. Dzhilkibaev, A.G. Solovjev, G.V. Domogatsky, A. V. Skurikhin, V.A. Tabolenko, V. Nazari, V. M. Aynutdinov, M.B. Milenin, Sergey Yakovlev, M.N. Sorokovikov, Fedor Šimkovic, G.B. Safronov, Rastislav Dvornický, A.V. Avrorin, N.S. Gorshkov, S.V. Fialkovsky, and E. O. Sushenok

Subjects
Quality (physics), Computer science, Data quality, Real-time computing, Detector, Experimental data, Monitoring system, Point (geometry)
Abstract

The quality of the incoming experimental data has a significant importance for both analysis and running the experiment. The main point of the Baikal-GVD DQM system is to monitor the status of the detector and obtained data on the run-by-run based analysis. It should be fast enough to be able to provide analysis results to detector shifter and for participation in the global multimessenger system.

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