Evans 2008 Improving Swift-XRT positions of GRBs

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Title:		Improving Swift-XRT positions of GRBs
Authors:		Evans, P. A.; Beardmore, A. P.; Goad, M. R.; Osborne, J. P.; Burrows, D. N.; Gehrels, N.
Publication:		eprint arXiv:0801.4462
Publication Date:		01/2008
Origin:		ARXIV
Keywords:		Astrophysics
Comment:		4 pages, to appear in the proceedings of "Gamma Ray Bursts 2007, Santa Fe"
Bibliographic Code:		2008arXiv0801.4462E

Abstract

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"> Bibtex entry for this abstract Preferred format for this abstract (see Preferences)