GRBlog: GCN 9387

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GRB 090518: Enhanced Swift-XRT position	Evans et al.
	GCN 9387

SOURCE: GCN
TITLE: GCN CIRCULAR
NUMBER: 9387
SUBJECT: GRB 090518: Enhanced Swift-XRT position
DATE: 09/05/18 08:33:11 GMT
FROM: Phil Evans at U of Leicester <pae9@star.le.ac.uk>

P. A. Evans, M. R. Goad, J. P. Osborne, and A. P. Beardmore (U. Leicester) report on behalf of the Swift-XRT team.

Using 3965 s of XRT Photon Counting mode data and 8 UVOT images for GRB 090518, we find an astrometrically corrected X-ray position (using the XRT-UVOT alignment and matching UVOT field sources to the USNO-B1 catalogue): RA, Dec = 119.95404, +0.75921 which is equivalent to: RA (J2000): 07h 59m 48.97s Dec (J2000): +00d 45' 33.2" with an uncertainty of 1.6 arcsec (radius, 90% confidence). This position may be improved as more data are received. The latest position can be viewed at http://www.swift.ac.uk/xrt_positions. Position enhancement is described by Goad et al. (2007, A&A, 476, 1401) and Evans et al. (2009, arXiv:0812.3662). This circular was automatically generated, and is an official product of the Swift-XRT team.

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