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Discovery of the nearby long, soft GRB 100316D with an associated supernova

Abstract : We report the Swift discovery of nearby long, soft gamma-ray burst GRB 100316D, and the subsequent unveiling of its low redshift host galaxy and associated supernova. We derive the redshift of the event to be z = 0.0591 +/- 0.0001 and provide accurate astrometry for the GRB-SN. We study the extremely unusual prompt emission with time-resolved gamma-ray to X-ray spectroscopy, and find that the spectrum is best modelled with a thermal component in addition to a synchrotron emission component with a low peak energy. The X-ray light curve has a remarkably shallow decay out to at least 800 s. The host is a bright, blue galaxy with a highly disturbed morphology and we use Gemini South, VLT and HST observations to measure some of the basic host galaxy properties. We compare and contrast the X-ray emission and host galaxy of GRB 100316D to a subsample of GRB-SNe. GRB 100316D is unlike the majority of GRB-SNe in its X-ray evolution, but resembles rather GRB 060218, and we find that these two events have remarkably similar high energy prompt emission properties. Comparison of the host galaxies of GRB-SNe demonstrates, however, that there is a great diversity in the environments in which GRB-SNe can be found. GRB 100316D is an important addition to the currently sparse sample of spectroscopically confirmed GRB-SNe, from which a better understanding of long GRB progenitors and the GRB--SN connection can be gleaned.
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https://hal.archives-ouvertes.fr/hal-00708865
Contributor : Paolo Goldoni Connect in order to contact the contributor
Submitted on : Monday, August 1, 2022 - 8:22:56 AM
Last modification on : Tuesday, August 2, 2022 - 8:28:21 AM
Long-term archiving on: : Wednesday, November 2, 2022 - 6:23:33 PM

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R.L.C. Starling, K. Wiersema, A. J. Levan, T. Sakamoto, D. Bersier, et al.. Discovery of the nearby long, soft GRB 100316D with an associated supernova. Monthly Notices of the Royal Astronomical Society, 2011, 411, pp.2792-2803. ⟨10.1111/j.1365-2966.2010.17879.x⟩. ⟨hal-00708865⟩

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