The Background of the INTEGRAL SPI Anticoincidence Shield and the Observations of GRBs

Details The Background of the INTEGRAL SPI Anticoincidence Shield and the Observations of GRBs The Background of the INTEGRAL SPI Anticoincidence Shield and the Observations of GRBs

Oct 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004esasp.552..649l&link_type=abstract

Proceedings of the 5th INTEGRAL Workshop on the INTEGRAL Universe (ESA SP-552). 16-20 February 2004, Munich, Germany. Scientific

Physics

Scientific paper

The anti-coincidence shield, ACS, of the spectro- meter, SPI (Vedrenne et al., 2003), on INTEGRAL provides the possibility to study temporal properties of gamma-ray bursts (GRBs) with high resolution (Rau et al. 2004). To correctly interpret the results of the analysis, a good understanding of the back- ground and noise levels of the instrument is required. The background noise of the ACS, on timescales up to the length of a GRB, has a Gaussian distribution and its power is independent of frequency, that is, it is white noise. However, it does not follow a Poisson statistic since on average the variance is ˜ 1.6 times larger than the mean, and varies significantly. We find a systematic relation between the mean count rate and its variance. The ratio, variance/mean, de- creases as the mean count rate increases. As well as helping to understand the cause of this effect, this characterisation is useful when modelling the time variability of GRBs. To illustrate the discus- sion we present some GRB light curves detected by the SPI/ACS and shortly discuss the analysis that has been made of them. Key words: GRBs; SPI ACS.

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