TITLE: GCN CIRCULAR NUMBER: 40410 SUBJECT: GRB 250509A: Prompt enhanced Swift-XRT position DATE: 25/05/09 23:32:52 GMT FROM: Phil Evans at U of Leicester pae9@star.le.ac.uk
P.A. Evans (U. Leicester) reports on behalf of the Swift-XRT team:
Using 426 s of promptly downlinked XRT event data for GRB 250509A, we find an enhanced XRT position of the afterglow: RA, Dec: 46.44960, -38.84128 which is equivalent to: RA (J2000) = 03 05 47.90 Dec (J2000) = -38 50 28.6 with an uncertainty of 1.9 arcseconds (radius, 90% confidence). Analysis of the promptly available data is online at http://www.swift.ac.uk/sper/1311764.
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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