[vsnet-grb-info 21171] GRB 180925A: Prompt enhanced Swift-XRT position

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  23270
SUBJECT: GRB 180925A: Prompt enhanced Swift-XRT position
DATE:    18/09/25 15:22:50 GMT
FROM:    Phil Evans at U of Leicester  <pae9 at leicester.ac.uk>

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

Using  promptly downlinked XRT event data for GRB 180925A, we find an
enhanced XRT position of the afterglow: RA, Dec: 315.2038, -64.4569
which is equivalent to:
   RA (J2000)  = 21 00 48.92
   Dec (J2000) = -64 27 24.9
with an uncertainty of 2.1 arcseconds (radius, 90% confidence).
Analysis of the promptly available data is online at
http://www.swift.ac.uk/sper/863421.

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.