Extended emission from short gamma-ray bursts detected with SPI-ACS/INTEGRAL

Astronomy Letters - Tập 36 - Trang 707-720 - 2010
P. Yu. Minaev1,2, A. S. Pozanenko1, V. M. Loznikov1
1Space Research Institute, Russian Academy of Sciences, Moscow, Russia
2Sternberg Astronomical Institute, Moscow, Russia

Tóm tắt

The short duration (T 90 < 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.

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