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GRB 100728B: Enhanced Swift-XRT position
Evans et al.
SOURCE: GCN
TITLE: GCN CIRCULAR
NUMBER: 11017
SUBJECT: GRB 100728B: Enhanced Swift-XRT position
DATE: 10/07/28 14:29:45 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 820 s of XRT Photon Counting mode data and 2 UVOT images, 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 = 44.05620, 0.28120 which is equivalent to: RA (J2000): 02 56 13.48 Dec (J2000): +00 16 52.5 with an uncertainty of 2.0 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, MNRAS, 397, 1177). This circular is an official product of the Swift-XRT team.

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