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MNRAS-2011-Starling-2792-803.pdf (18.33 MB)

Discovery of the nearby long, soft GRB100316D with an associated supernova

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posted on 2012-10-24, 09:06 authored by R. L. C. Starling, K. Wiersema, A. Rowlinson, N. R. Tanvir, P. T. O'Brien, K. L. Page, J. P. Osborne, P. A. Evans, C. P. Hurkett, A. J. Levan, T. Sakamoto, S. T. Holland, N. Gehrels, M. Stamatikos, D. Bersier, Z. Cano, P. Goldoni, S. R. Oates, P. A. Curran, De Pasquale M., N. P. M. Kuin, S. Campana, S. Covino, P. D'Avanzo, C. C. Thöne, J. Sollerman, D. Malesani, J. P. U. Fynbo, J. Hjorth, S. D. Vergani, H. Flores, S. Barthelmy, A. S. Fruchter, D. N. Burrows, V. D'Elia, P. Garnavich, J. Gorosabel, Van Der Horst A. J., C. Kouveliotou, P. Jakobsson, A. P. Kamble, L. Kaper, P. A. Mazzali, E. Pian, P. E. Nugent, S. E. Woosley
We report the Swift discovery of the 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 gamma-ray burst (GRB) supernova (SN). We study the extremely unusual prompt emission with time-resolved γ-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, Very Large Telescope and Hubble Space Telescope 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.



Monthly Notices of the Royal Astronomical Society, 2011, 411 (4), pp. 2792-2803


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