Astronomy and Astrophysics – Astrophysics – Instrumentation and Methods for Astrophysics
Scientific paper
2010-03-02
Astronomy and Astrophysics
Astrophysics
Instrumentation and Methods for Astrophysics
3 pages, 4 figures. Accepted for publication in A&A
Scientific paper
AIMS: To determine the Point Source Location Accuracy (PSLA) for the INTEGRAL/IBIS telescope based on analysis of archival in-flight data. METHODS: Over 40000 individual pointings (science windows) of INTEGRAL/IBIS data were analysed using the latest Off-line Science Analysis software, version 7.0. Reconstructed source positions were then compared against the most accurate positions available, determined from focusing X-ray telescopes. Since the PSLA is a strong function of source detection significance, the offsets from true position were histogrammed against significance, so that the 90% confidence limits could be determined. This has been done for both sources in the fully coded field of view (FCFOV) and partially coded field of view (PCFOV). RESULTS: The PSLA is found to have improved significantly since values derived from early mission data and software for both FCFOV and PCFOV. CONCLUSIONS: This result has implications for observers executing follow-up programs on IBIS sources since the sky area to be searched is reduced by >50% in some cases.
Bazzano Angela
Bird Andrew J.
Clark David J.
Dean Anthony J.
Hill Adam B.
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