TITLE: GCN CIRCULAR NUMBER: 17594 SUBJECT: GRB 150317A: Enhanced Swift-XRT position DATE: 15/03/17 08:03:37 GMT FROM: Phil Evans at U of Leicester P.A. Evans and M.R. Goad (U. Leicester) report on behalf of the Swift-XRT team: Using 2091 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 = 138.98467, 55.46618 which is equivalent to: RA (J2000): 09h 15m 56.32s Dec (J2000): +55d 27' 58.2" with an uncertainty of 2.2 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.