Astronomy and Astrophysics – Astrophysics
Scientific paper
2003-03-24
Astrophys.J. 597 (2003) 1010-1016
Astronomy and Astrophysics
Astrophysics
26 pages, 11 figures, submitted to ApJ
Scientific paper
10.1086/378511
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.
Butler Nathaniel R.
Crew Geoffrey B.
Ford Peter G.
Jernigan Garrett J.
Lamb Donald Q.
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