[vsnet-grb-info 9509] GRB 100725A: Prompt enhanced Swift-XRT position

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  10980
SUBJECT: GRB 100725A: Prompt enhanced Swift-XRT position
DATE:    10/07/25 08:02:01 GMT
FROM:    Phil Evans at U of Leicester  <pae9 at star.le.ac.uk>

P.A. Evans (U. Leicester) reports on behalf of the Swift-XRT team:

Using  promptly downlinked XRT event data for GRB 100725A, we find an
enhanced XRT position of the afterglow: RA, Dec: 166.4815, -26.6703
which is equivalent to:
   RA (J2000)  = 11 05 55.57
   Dec (J2000) = -26 40 12.9
with an uncertainty of 2.2 arc sec (radius, 90% confidence). Analysis
of the promptly available data is online at
http://www.swift.ac.uk/sper/429954.

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.