Analysis of the IBIS-ISGRI systematic source location offsets
Abstract
In this paper we investigate the residual bias in the source positions provided by the standard software of the INTEGRAL IBIS-ISGRI data by analyzing a large number of observations covering more than ten years of the mission. We found a clear dependence of the bias on the satellite roll angle that can be reduced by independent modeling of the IBIS mask quarter displacements and of the photon penetration effect in the ISGRI detector pixels. Preliminary results of this study are presented for strong sources.
- Publication:
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Memorie della Societa Astronomica Italiana
- Pub Date:
- 2019
- Bibcode:
- 2019MmSAI..90..263G
- Keywords:
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- Coded Masks;
- Gamma-Ray Astronomy