Change search
ReferencesLink to record
Permanent link

Direct link
The Background of the INTEGRAL SPI Anticoincidence Shield and the Observations of GRBs
Stockholm Observatory, AlbaNova.ORCID iD: 0000-0002-9769-8016
Show others and affiliations
2004 (English)In: PROCEEDINGS OF THE 5TH INTEGRAL WORKSHOP ON THE INTEGRAL UNIVERSE / [ed] Battrick, B, European Space Agency, 2004, Vol. 552, 649-652 p.Conference paper (Refereed)
Abstract [en]

The anti-coincidence shield, ACS, of the spectrometer, 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 back-round noise of the ACS, oil 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 similar to 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, decreases 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 discussion we present some GRB light curves detected by the SPI/ACS and shortly discuss the analysis that has been made of them.

Place, publisher, year, edition, pages
European Space Agency, 2004. Vol. 552, 649-652 p.
, ESA Special Publications, ISSN 0379-6566 ; 552
Keyword [en]
National Category
Astronomy, Astrophysics and Cosmology
URN: urn:nbn:se:kth:diva-80180ISI: 000227471700118ScopusID: 2-s2.0-23844526787ISBN: 92-9092-863-8OAI: diva2:496038
5th INTEGRAL Workshop on The INTEGRAL Universe; Munich; 16 February 2004 through 20 February 2004
QC 20120219Available from: 2012-02-09 Created: 2012-02-09 Last updated: 2012-02-19Bibliographically approved

Open Access in DiVA

No full text


Search in DiVA

By author/editor
Ryde, FelixPearce, Mark
By organisation
Astronomy, Astrophysics and Cosmology

Search outside of DiVA

GoogleGoogle Scholar
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Total: 13 hits
ReferencesLink to record
Permanent link

Direct link