1. A tale of two GRB-SNe at a common redshift of z=0.54
- Author
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Richard G. Strom, A. de Ugarte Postigo, E. Klunko, Josh Haislip, V. V. Sokolov, Yiseul Jeon, W. K. Park, Vasilij Rumyantsev, Carole Mundell, Ralph A. M. J. Wijers, D. Bersier, Peter M. Garnavich, N. Clay, Ovidiu Vaduvescu, James E. Rhoads, A. J. Castro-Tirado, U. K. Gurugubelli, Iain A. Steele, P. T. O'Brien, A. Melandri, Y.-B. Jeon, Javier Gorosabel, Evert Rol, Peter Nugent, P. A. Curran, A. Pozanenko, A. J. van der Horst, Yuji Urata, Chryssa Kouveliotou, A. Volvach, R. L. C. Starling, Nial R. Tanvir, Raffaella Margutti, Andreja Gomboc, J. Alonso-Lorite, Daniel Kasen, D. R. Young, Andrew J. Levan, Myungshin Im, Zach Cano, Paolo A. Mazzali, A. S. Moskvitin, A. Volnova, G. C. Anupama, John F. Graham, Kuiyun Huang, Avon Huxor, Daniel E. Reichart, D. Shakhovskoy, J. L. Bibby, Yiannis Tsapras, K. M. Ivarsen, Alberto Fernández-Soto, Martin Burgdorf, A. S. Fruchter, S. E. Woosley, D. K. Sahu, V. Peris, K. M. Svensson, C. J. Mottram, Atish Kamble, Emma E. Small, T. A. Fatkhullin, Klaas Wiersema, V. Loznikov, Mansur Ibrahimov, Guy G. Pooley, Elena Pian, Aaron P. LaCluyze, C. Guidorzi, Victoria Scowcroft, Rory Smith, Shiho Kobayashi, and Melissa C. Nysewander
- Subjects
Physics ,Brightness ,Astrophysics::High Energy Astrophysical Phenomena ,Extinction (astronomy) ,Astronomy and Astrophysics ,Context (language use) ,Astrophysics::Cosmology and Extragalactic Astrophysics ,Astrophysics ,Light curve ,Redshift ,Afterglow ,Supernova ,Space and Planetary Science ,Astrophysics::Solar and Stellar Astrophysics ,Gamma-ray burst ,Astrophysics::Galaxy Astrophysics - Abstract
We present ground-based and HST optical observations of the optical transients (OTs) of long-duration Gamma Ray Bursts (GRBs) 060729 and 090618, both at a redshift of z = 0.54. For GRB 060729, bumps are seen in the optical light curves (LCs), and the late-time broadband spectral energy distributions (SEDs) of the OT resemble those of local type Ic supernovae (SNe). For GRB 090618, the dense sampling of our optical observations has allowed us to detect well-defined bumps in the optical LCs, as well as a change in colour, that are indicative of light coming from a core-collapse SN. The accompanying SNe for both events are individually compared with SN1998bw, a known GRB-supernova, and SN1994I, a typical type Ic supernova without a known GRB counterpart, and in both cases the brightness and temporal evolution more closely resemble SN1998bw. We also exploit our extensive optical and radio data for GRB 090618, as well as the publicly-available SWIFT -XRT data, and discuss the properties of the afterglow at early times. In the context of a simple jet-like model, the afterglow of GRB 090618 is best explained by the presence of a jet-break at t-to > 0.5 days. We then compare the rest-frame, peak V -band absolute magnitudes of all of the GRB and X-Ray Flash (XRF)-associated SNe with a large sample of local type Ibc SNe, concluding that, when host extinction is considered, the peak magnitudes of the GRB/XRF-SNe cannot be distinguished from the peak magnitudes of non-GRB/XRF SNe.
- Published
- 2011
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