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Your search keyword '"C. Sinnis"' showing total 8 results
Start Over Author "C. Sinnis" Publisher american astronomical society
8 results on '"C. Sinnis"'

1. Evidence for T[CLC]e[/CLC]V Emission from GRB 970417[CLC]a[/CLC]

Author

A. J. Smith, Miguel F. Morales, A. Shoup, Kelin Wang, D. G. Coyne, C. M. Hoffman, R. W. Ellsworth, Mark L. McConnell, J. F. McCullough, S. Westerhoff, M. O. Wascko, Tumay O. Tumer, B. Shen, R. W. Atkins, James M. Ryan, T. Yang, Wystan Benbow, R. Fleysher, Peter Nemethy, D. Berley, L. A. Kelley, Allen Mincer, Todd Haines, Richard Miller, L. Fleysher, M. L. Chen, I. Leonor, G. W. Sullivan, Brenda Dingus, D. E. Dorfan, Galen Gisler, J. A. Goodman, A. Falcone, J. E. McEnery, S. Hugenberger, David A. Williams, D. Evans, C. Sinnis, and G. B. Yodh

Subjects
Physics, High energy, Large field of view, Astrophysics::High Energy Astrophysical Phenomena, media_common.quotation_subject, Gamma ray, Astronomy, Astronomy and Astrophysics, Field of view, Astrophysics, Space and Planetary Science, Coincident, Sky, Gamma-ray burst, media_common
Abstract

Milagrito, a detector sensitive to very high energy gamma rays, monitored the northern sky from 1997 February through 1998 May. With a large field of view and a high duty cycle, this instrument was well suited to perform a search for TeV gamma-ray bursts (GRBs). We report on a search made for TeV counterparts to GRBs observed by BATSE. BATSE detected 54 GRBs within the field of view of Milagrito during this period. An excess of events coincident in time and space with one of these bursts, GRB 970417a, was observed by Milagrito. The excess has a chance probability of 2.8 × 10-5 of being a fluctuation of the background. The probability for observing an excess at least this large from any of the 54 bursts is 1.5 × 10-3. No significant correlations were detected from the other bursts.

Published
2000
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2. T[CLC]e[/CLC]V Observations of Markarian 501 with the Milagrito Water Cerenkov Detector

Author

R. Atkins, W. Benbow, D. Berley, M. L. Chen, D. G. Coyne, R. S. Delay, B. L. Dingus, D. E. Dorfan, R. W. Ellsworth, C. Espinoza, D. Evans, A. Falcone, L. Fleysher, R. Fleysher, G. Gisler, J. A. Goodman, T. J. Haines, C. M. Hoffman, S. Hugenberger, L. A. Kelley, I. Leonor, M. McConnell, J. F. McCullough, J. E. McEnery, R. S. Miller, A. I. Mincer, M. F. Morales, M. M. Murray, P. Nemethy, J. M. Ryan, M. Schneider, B. Shen, A. Shoup, C. Sinnis, A. J. Smith, G. W. Sullivan, T. N. Thompson, T. Tumer, K. Wang, M. O. Wascko, S. Westerhoff, D. A. Williams, T. Yang, G. B. Yodh, and null (The Milagro Collaboration)

Subjects
Physics, Space and Planetary Science, law, Sky, Cherenkov detector, media_common.quotation_subject, Milagro, Detector, Astronomy and Astrophysics, Astrophysics, Flare, law.invention, media_common
Abstract

The Milagrito water Cherenkov detector near Los Alamos, New Mexico, operated as a sky monitor at energies of a few TeV between February 1997 and May 1998 including the period of the strong, long-lasting 1997 flare of Markarian 501. Milagrito served as a test run for the full Milagro detector. An event excess with a significance of 3.7 sigma from Markarian 501 was observed, in agreement with expectations.

Published
1999
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3. Search for ultra-high energy radiation from gamma-ray bursts

Author

D. D. Weeks, R. Schnee, G. E. Allen, G. B. Yodh, Luke Zoltan Kelley, T. Yang, J. A. Goodman, G. M. Dion, D. E. Alexandreas, M. Harmon, P. Chumney, C. Sinnis, M. Cavalli-Sforza, C. M. Hoffman, A. L. Shoup, D. E. Dorfan, M. L. Chen, C. Y. Chang, S. C. Schaller, J. P. Wu, Mike Stark, T. J. Haines, S. D. Biller, C. Dion, David A. Williams, D. E. Nagle, D. Berley, R. L. Burman, D. M. Schmidt, R. W. Ellsworth, D. G. Coyne, S. R. Klein, and W. P. Zhang

Subjects
Physics, Photon, Space and Planetary Science, Astronomy, Astronomy and Astrophysics, Gamma-ray astronomy, Astrophysics, Gamma-ray burst, Astronomical spectroscopy, Radiofrequency radiation
Published
1994
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4. Search for Ultra--High-Energy Point-Source Emission over Various Timescales

Author

M. L. Chen, G. E. Allen, David R. Williams, S. R. Klein, W. P. Zhang, D. C. Coyne, R. Schnee, P. Chumney, C. Dion, S. C. Schaller, Mike Stark, G. M. Dion, J. P. Wu, C. Y. Chang, D. M. Schmidt, D. E. Alexandreas, M. Cavalli-Sforza, A. L. Shoup, C. M. Hoffman, Luke Zoltan Kelley, T. Yang, R. L. Burman, J. A. Goodman, G. B. Yodh, T. J. Haines, D. E. Nagle, S. D. Biller, M. Harmon, R. W. Ellsworth, C. Sinnis, D. D. Weeks, D. E. Dorfan, and D. Berley

Subjects
Physics, High energy, Space and Planetary Science, Point source, Astronomy, Astronomy and Astrophysics, Astrophysics
Published
1994
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5. Search for Emission of Ultra--High-Energy Radiation from Active Galactic Nuclei

Author

A. L. Shoup, D. E. Dorfan, D. E. Nagle, C. M. Hoffman, Luke Zoltan Kelley, T. Yang, P. Chumney, S. R. Klein, W. P. Zhang, D. D. Weeks, R. W. Ellsworth, R. L. Burman, G. M. Dion, M. Cavalli-Sforza, T. J. Haines, S. D. Biller, Mike Stark, David A. Williams, S. C. Schaller, C. Sinnis, D. Berley, D. E. Alexandreas, G. E. Allen, J. P. Wu, J. A. Goodman, G. B. Yodh, C. Y. Chang, M. L. Chen, D. C. Coyne, R. Schnee, and C. Dion

Subjects
Physics, Active galactic nucleus, biology, Flux, Astronomy, Astronomy and Astrophysics, Astrophysics, Radiation, biology.organism_classification, Space and Planetary Science, Egret, BL Lac object, Radiofrequency radiation, Continuous emission
Abstract

The CYGNUS air-shower array has been used to search for emission of ultra-high-energy gamma radiation from 13 active galactic nuclei (AGNs) that were detected by EGRET. The data set spans the period 1986 April 2 to 1993 January 1. The data set has been searched for continuous emission, for emission on the time scale of 1 week, and for emission on the time scale of 1 day. No evidence for emission from any of the AGNs on any of the time scales examined was found. The 90% Confidence Level (CL) upper limit to the continuous flux from Mrk 421 above 50 TeV is 7.5×10 -14 cm -1 s -1

Published
1993
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6. Daily search for emission of ultra-high-energy radiation from point sources

Author

D. E. Alexandreas, G. Allen, D. Berley, S. Biller, R. L. Burman, D. R. Cady, M. Cavalli-Sforza, C. Y. Chang, D. Coyne, C. Dion, G. M. Dion, D. Dorfan, R. W. Ellsworth, S. J. Freedman, B. K. Fujikawa, J. A. Goodman, T. J. Haines, C. M. Hoffman, L. Kelley, S. Klein, D. A. Krakauer, P. W. Kwok, X.-Q. Lu, D. E. Nagle, M. Potter, V. D. Sandberg, C. Sinnis, A. Shoup, M. J. Stark, P. R. Vishwanath, D. D. Weeks, D. A. Williams, J.-P. Wu, G. B. Yodh, W. Zhang, and null The CYGNUS Collaboration

Subjects
Physics, Point source, Astrophysics::High Energy Astrophysical Phenomena, Astrophysics::Instrumentation and Methods for Astrophysics, Cataclysmic variable star, Astronomy, Astronomy and Astrophysics, Cosmic ray, Astrophysics::Cosmology and Extragalactic Astrophysics, Astrophysics, Gamma-ray astronomy, Galaxy, Air shower, Crab Nebula, Pulsar, Space and Planetary Science
Abstract

A daily search for emission of ultra-high-energy radiation from astrophysical point sources using the CYGNUS extensive air shower array is described. The data set spans the period from 1986 April 4 to 1992 June 22. Fifty-one astrophysical objects have been examined, including Cyg X-3, Her X-1, the Crab, a number of gamma-ray and X-ray sources from the COS B and the fourth Uhuru catalogs, and several cataclysmic variables, nearby galaxies, and radio pulsars. The observed daily number of events from the source directions are consistent with expected statistical fluctuations of the number of events from backgrounds cosmic rays

Published
1993
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7. A search of the northern sky for ultra-high-energy point sources

Author

P. R. Vishwanath, S. D. Biller, V. D. Sandberg, D. E. Alexandreas, R. W. Ellsworth, Todd Haines, C. Dion, C. M. Hoffman, R. L. Burman, D. A. Krakauer, P. W. Kwok, D. E. Nagle, C. Y. Chang, G. M. Dion, D. Berley, D. R. Cady, M. E. Potter, Brenda Dingus, B. K. Fujikawa, Mike Stark, S. J. Freedman, W. P. Zhang, J. A. Goodman, X. Q. Lu, G. B. Yodh, and C. Sinnis

Subjects
Physics, Point source, media_common.quotation_subject, Gamma ray, Flux, Astronomy and Astrophysics, Cosmic ray, Astrophysics, Radiation, Declination, Air shower, Space and Planetary Science, Sky, media_common
Abstract

A search has been made for steady emission or ultra-high-energy radiation from individual point sources over most or the northern sky. Over 2×10 8 air showers induced by primary particles or energy greater than about 10 TeV were recorded from 1986 April until 1991 May by the CYGNUS air shower array. No statistically significant excess above the background from the isotropic flux or cosmic rays was found for any direction in the sky from 0° to 80° declination. In addition, 49 specific potential sources were examined, and none showed a statistically significant excess or events

Published
1991
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8. VHE gamma rays from Hercules X-1

Author

J. P. Finley, C. Sinnis, D.D. Reeder, Ugo Camerini, John G. Learned, John Matthews, M. Lomperski, Patrick Slane, J. Hudson, F. Loeffler, Andrew Szentgyorgyi, G. H. Sembroski, V. J. Stenger, W. F. Fry, R. Loveless, R. H. March, M. Kertzman, J. Jennings, L. Kelley, T. Palfrey, A. Kenter, R. Morse, L. K. Resvanis, Christine D. Wilson, J. A. Gaidos, and D. D. Weeks

Subjects
Physics, Neutron star, Pulsar, Space and Planetary Science, Binary star, Precession, Gamma ray, X-ray binary, Astronomy, Astronomy and Astrophysics, Gamma-ray astronomy, Cherenkov radiation
Published
1988
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