TITLE: GCN CIRCULAR NUMBER: 41272 SUBJECT: GRB 250807B: Enhanced Swift-XRT position DATE: 25/08/07 19:34:25 GMT FROM: Phil Evans at U of Leicester pae9@star.le.ac.uk

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

Using 1712 s of XRT Photon Counting mode data and 5 UVOT images for GRB 250807B, 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 = 15.63710, -59.11896 which is equivalent to:

RA (J2000): 01h 02m 32.90s Dec (J2000): -59d 07' 08.3"

with an uncertainty of 2.4 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 was automatically generated, and is an official product of the Swift-XRT team.

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