Discovery of the nearby long, soft GRB 100316D with an associated supernova - Astrophysics > Cosmology and Nongalactic AstrophysicsReport as inadecuate




Discovery of the nearby long, soft GRB 100316D with an associated supernova - Astrophysics > Cosmology and Nongalactic Astrophysics - Download this document for free, or read online. Document in PDF available to download.

Abstract: We report the Swift discovery of nearby long, soft gamma-ray burst GRB100316D, and the subsequent unveiling of its low redshift host galaxy andassociated 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 extremelyunusual prompt emission with time-resolved gamma-ray to X-ray spectroscopy, andfind that the spectrum is best modelled with a thermal component in addition toa synchrotron emission component with a low peak energy. The X-ray light curvehas 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 andHST observations to measure some of the basic host galaxy properties. Wecompare and contrast the X-ray emission and host galaxy of GRB 100316D to asubsample of GRB-SNe. GRB 100316D is unlike the majority of GRB-SNe in itsX-ray evolution, but resembles rather GRB 060218, and we find that these twoevents have remarkably similar high energy prompt emission properties.Comparison of the host galaxies of GRB-SNe demonstrates, however, that there isa great diversity in the environments in which GRB-SNe can be found. GRB100316D is an important addition to the currently sparse sample ofspectroscopically confirmed GRB-SNe, from which a better understanding of longGRB progenitors and the GRB-SN connection can be gleaned.



Author: R.L.C. Starling U. Leicester, K. Wiersema, A.J. Levan, T. Sakamoto, D. Bersier, P. Goldoni, S.R. Oates, A. Rowlinson, S. Campana,

Source: https://arxiv.org/



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