Short gamma-ray bursts in the SPI-ACS INTEGRAL experiment
P. Yu. MinaevSpace Research Institute, Russian Academy of Sciences, Profsoyuznaya ul. 84/32, Moscow, 117997, RussiaA. PozanenkoSpace Research Institute, Russian Academy of Sciences, Profsoyuznaya ul. 84/32, Moscow, 117997, RussiaВ. М. ЛозниковSpace Research Institute, Russian Academy of Sciences, Profsoyuznaya ul. 84/32, Moscow, 117997, Russia
2010en
ABI
Abstract
We analyze short-duration gamma-ray bursts (T 90<2 s) recorded in the SPI-ACS experiment of the INTEGRAL observatory. We found an extended emission in the averaged light curve of both short-duration gamma-ray bursts and unidentified short-duration events. We show that the fraction of short-duration gamma-ray bursts among all the gamma-ray bursts recorded in the SPI-ACS experiment may be as high as 30 to 45%. We find the fraction of short gamma-ray bursts to augment while increasing the lower energy threshold. We report evidence for the absence of the class of very short gamma-ray bursts.
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