Possible detection of hard X-ray afterglows of short gamma-ray bursts

Details Possible detection of hard X-ray afterglows of short gamma-ray bursts Possible detection of hard X-ray afterglows of short gamma-ray bursts

2001-10-09

arxiv.org/abs/astro-ph/0110215v1

Astronomy and Astrophysics

Astrophysics

6 pages, 4 postscript figures, accepted for publication in A&AL. This version of the manuscript contains one figure that will

Scientific paper

10.1051/0004-6361:20011485

We report the discovery of a transient and fading hard X-ray emission in the BATSE lightcurves of a sample of short gamma-ray bursts. We have summed each of the four channel BATSE light curves of 76 short bursts to uncover the average overall temporal and spectral evolution of a possible transient signal following the prompt flux. We found an excess emission peaking ~30 s after the prompt one, detectable for ~100 s. The soft power-law spectrum and the time-evolution of this transient signal suggest that it is produced by the deceleration of a relativistic expanding source, as predicted by the afterglow model.

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