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A new determination of the INTEGRAL/IBIS point source location accuracy

A new determination of the INTEGRAL/IBIS point source location accuracy
A new determination of the INTEGRAL/IBIS point source location accuracy
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.
0004-6361
Scaringi, S.
5a05d9eb-9bfb-455a-abb1-b1ed3229f977
Bird, A.J.
045ee141-4720-46fd-a412-5aa848a91b32
Hill, A.B.
b1007941-b5b1-47cd-8476-7c6b9c57f347
Clark, D.J.
4d37cdbe-d8f5-47c6-a135-7950843def36
McBride, V.A.
a4608811-5a3f-4218-ada0-28f57ec2a0fd
Dean, A.J.
2f9093f2-855c-4769-b1aa-6dd621b5dcf1
Bazzano, A.
8eef0c6e-1a5f-4bcd-a034-9a5c3b29104d
Natalucci, L.
1a93c54f-3598-4523-9b3f-2871ad23af5f
Stephen, J.B.
c0b1afce-f3d9-4568-b2c1-51482f80cd9a
Scaringi, S.
5a05d9eb-9bfb-455a-abb1-b1ed3229f977
Bird, A.J.
045ee141-4720-46fd-a412-5aa848a91b32
Hill, A.B.
b1007941-b5b1-47cd-8476-7c6b9c57f347
Clark, D.J.
4d37cdbe-d8f5-47c6-a135-7950843def36
McBride, V.A.
a4608811-5a3f-4218-ada0-28f57ec2a0fd
Dean, A.J.
2f9093f2-855c-4769-b1aa-6dd621b5dcf1
Bazzano, A.
8eef0c6e-1a5f-4bcd-a034-9a5c3b29104d
Natalucci, L.
1a93c54f-3598-4523-9b3f-2871ad23af5f
Stephen, J.B.
c0b1afce-f3d9-4568-b2c1-51482f80cd9a

Scaringi, S., Bird, A.J., Hill, A.B., Clark, D.J., McBride, V.A., Dean, A.J., Bazzano, A., Natalucci, L. and Stephen, J.B. (2010) A new determination of the INTEGRAL/IBIS point source location accuracy. Astronomy & Astrophysics. (doi:10.1051/0004-6361/201014209). (In Press)

Record type: Article

Abstract

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.

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More information

Accepted/In Press date: 2010

Identifiers

Local EPrints ID: 144749
URI: http://eprints.soton.ac.uk/id/eprint/144749
ISSN: 0004-6361
PURE UUID: edf2be0e-faae-4b7a-9fed-94d05af3fb7d
ORCID for A.J. Bird: ORCID iD orcid.org/0000-0002-6888-8937
ORCID for A.B. Hill: ORCID iD orcid.org/0000-0003-3470-4834

Catalogue record

Date deposited: 25 May 2010 11:38
Last modified: 09 Nov 2021 03:08

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Contributors

Author: S. Scaringi
Author: A.J. Bird ORCID iD
Author: A.B. Hill ORCID iD
Author: D.J. Clark
Author: V.A. McBride
Author: A.J. Dean
Author: A. Bazzano
Author: L. Natalucci
Author: J.B. Stephen

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