GCN Circular 42557
Subject
GRB 251103B: Prompt enhanced Swift-XRT position
Event
Date
2025-11-03T17:23:46Z (2 days ago)
From
Phil Evans at U of Leicester <pae9@star.le.ac.uk>
Via
email
P.A. Evans (U. Leicester) reports on behalf of the Swift-XRT team:
Using 1.3 ks of promptly downlinked XRT event data for GRB 251103B, we
find an enhanced XRT position of the afterglow: RA, Dec: 105.87365,
-24.87162 which is equivalent to:
RA (J2000) = 07 03 29.68
Dec (J2000) = -24 52 17.8
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/1409824.
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.