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Hard X-ray afterglows of short GRBs

Davide Lazzati·Enrico Ramirez-Ruiz·Gabriele Ghisellini
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Abstract

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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Davide Lazzati, Enrico Ramirez-Ruiz, Gabriele Ghisellini. 2002-02-01. Hard X-ray afterglows of short GRBs. https://doi.org/10.1063/1.1579331

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