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Improving Swift-XRT positions of GRBs

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conference contribution
posted on 09.01.2017, 09:47 by P. A. Evans, A. P. Beardmore, M. R. Goad, J. P. Osborne, D. N. Burrows, N. Gehrels
Since GRBs fade rapidly, it is important to publish accurate, precise positions at early times. For Swift-detected bursts, the best promptly available position is most commonly the X-ray Telescope (XRT) position. We present two processes, developed by the Swift team at Leicester, which are now routinely used to improve the precision and accuracy of the XRT positions reported by the Swift team. Both methods, which are fully automated, make use of a PSF-fitting approach which accounts for the bad columns on the CCD. The first method yields positions with 90% error radii <4.4" 90% of the time, within 10–20 minutes of the trigger. The second method astrometrically corrects the position using UVOT field stars and the known mapping between the XRT and UVOT detectors, yielding enhanced positions with 90% error radii of <2.8" 90% of the time, usually 2 hours after the trigger

History

Citation

AIP Conference Proceedings Volume 1000, Issue 1: Gamma-Ray Bursts 2007, 2008, 1000, pp. 539-542 (4)

Author affiliation

/Organisation/COLLEGE OF SCIENCE AND ENGINEERING/Department of Physics and Astronomy

Source

Santa Fe Conference on Gamma-Ray Bursts, Santa Fe, NM

Version

AM (Accepted Manuscript)

Published in

AIP Conference Proceedings Volume 1000

Publisher

AIP Publishing

issn

0094-243X

isbn

978-0-7354-0533-2

Available date

09/01/2017

Publisher version

http://aip.scitation.org/doi/abs/10.1063/1.2943526

Editors

Galassi, M,;Palmer, D,;Fenimore, E,

Temporal coverage: start date

05/11/2007

Temporal coverage: end date

09/11/2007

Language

en