Evidence for a long duration component in the prompt emission of short Gamma-Ray Bursts detected with BeppoSAX

Details Evidence for a long duration component in the prompt emission of short Gamma-Ray Bursts detected with BeppoSAX Evidence for a long duration component in the prompt emission of short Gamma-Ray Bursts detected with BeppoSAX

2005-04-08

arxiv.org/abs/astro-ph/0504199v1

Astrophys.J. 625 (2005) L17-L21

Astronomy and Astrophysics

Astrophysics

12 pages, 6 figures, accepted for publication in ApJL

Scientific paper

10.1086/430759

A statistical study on the light curves of all the short Gamma-Ray Bursts detected with the Gamma Ray Burst Monitor (GRBM) aboard BeppoSAX is reported. Evidence for a very weak and long duration component associated with these events in the two 1 s counters of the GRBM (40-700 keV and >100 keV) is found. It starts a few tens of seconds before the burst and continues for about 30 s after the burst. The overall hardness of this component is comparable with that of the event itself. The detection of a signal before the onset time and the similar hardness are consistent with an interpretation of the long duration component in terms of prompt emission associated with short GRBs.

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