TITLE:   GCN CIRCULAR
NUMBER:  39960
SUBJECT: GRB 250331C: Prompt enhanced Swift-XRT position
DATE:    25/03/31 05:45:04 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 1.6 ks of promptly downlinked XRT event data for GRB 250331C, we
find an enhanced XRT position of the afterglow: RA, Dec: 80.95640,
33.06317 which is equivalent to:
   RA (J2000)  = 05 23 49.54
   Dec (J2000) = +33 03 47.4
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/1299967.

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.