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27 April 2024

» arxiv » astro-ph/0303539

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The X-ray Afterglows of GRB 020813 and GRB 021004 with Chandra HETGS: Possible Evidence for a Supernova Prior to GRB 020813
Nathaniel R. Butler ; Herman L. Marshall ; George R. Ricker ; Roland K. Vanderspek ; Peter G. Ford ; Geoffrey B. Crew ; Donald Q. Lamb ; J. Garrett Jernigan ;
Date:	24 Mar 2003
Journal:	Astrophys.J. 597 (2003) 1010-1016
Subject:	astro-ph
Abstract:	We report on the detection of an emission line near 1.3 keV, which we associate with blue-shifted hydrogen-like sulfur (S XVI), in a 76.8 ksec Chandra HETGS spectrum of the afterglow of GRB 020813. The line is detected at 3.3 sigma significance. We also find marginal evidence for a line possibly due to hydrogen-like silicon (Si XIV) with the same blue-shift. A line from Fe is not detected, though a very low significance Ni feature may be present. A thermal model fits the data adequately, but a reflection model may provide a better fit. There is marginal evidence that the equivalent width of the S XVI line decrease as the burst fades. We infer from these results that a supernova likely occurred >~ 2 months prior to the GRB. We find no discrete or variable spectral features in the Chandra HETGS spectrum of the GRB 021004 afterglow.
Source:	arXiv, astro-ph/0303539
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