The Sample of Gamma-ray Bursts Observed With SPI-ACS
arXiv:astro-ph/0405121 · doi:10.1393/ncc/i2005-10051-3
Abstract
The SPI anticoincidence shield consists of 91 BGO crystals and is operated as a nearly omnidirectional gamma-ray burst detector above ~75 keV. Since the start of the mission 269 gamma-ray burst candidates have been detected. 110 bursts have been confirmed with the instruments included in the 3rd Interplanetary Network. Here we present a preliminary statistical analysis of the SPI-ACS sample of gamma-ray bursts and gamma-ray burst candidates; in particular we discuss the duration distribution of the bursts. A prominent population of short burst candidates (duration <200ms) is found which is discovered to be strongly contaminated by cosmic-ray nuclei interacting in the detectors.
7 pages, 9 figures, esapub.cls, to appear in the Proceedings of the 5th INTEGRAL Workshop, Munich 2004