TITLE: GCN CIRCULAR NUMBER: 17270 SUBJECT: GRB 150103A: Prompt enhanced Swift-XRT position DATE: 15/01/03 20:37:39 GMT FROM: Phil Evans at U of Leicester P.A. Evans (U. Leicester) reports on behalf of the Swift-XRT team: Using promptly downlinked XRT event data for GRB 150103A, we find an enhanced XRT position of the afterglow: RA, Dec: 131.6663, -48.8863 which is equivalent to: RA (J2000) = 08 46 39.92 Dec (J2000) = -48 53 10.6 with an uncertainty of 2.0 arcseconds (radius, 90% confidence). Analysis of the promptly available data is online at http://www.swift.ac.uk/sper/623368. Position enhancement is 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.