Extended Emission from Short Gamma-Ray Bursts Detected with SPI-ACS/INTEGRAL

Abstract

The short duration (T90 < 2 s) gamma-ray bursts (GRBs) detected in the SPI-ACS experiment onboard the INTEGRAL observatory are investigated. Averaged light curves have been constructed for various groups of events, including short GRBs and unidentified short events. Extended emission has been found in the averaged light curves of both short GRBs and unidentified short events. It is shown that the fraction of the short GRBs in the total number of SPI-ACS GRBs can range from 30 to 45%, which is considerably larger than has been thought previously.

27 pages, 10 figures

References in corpus (3)

• The First Swift BAT Gamma-Ray Burst Catalog
• The 1st INTEGRAL SPI-ACS Gamma-Ray Burst Catalogue
• The updated spectral catalogue of INTEGRAL Gamma-Ray Bursts

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