GCN Circular 38479
Subject
GRB 241209A: Prompt enhanced Swift-XRT position
Date
2024-12-09T06:41:12Z (a month ago)
From
K.L. Page at U Leicester <klp5@leicester.ac.uk>
Via
email
K.L. Page and P.A. Evans (U. Leicester) report on behalf of the Swift-XRT
team.
Using promptly downlinked XRT event data for GRB 241209A, we find a fading
X-ray source with an enhanced position: RA,Dec = 155.39704, 6.32828
(degrees) which is equivalent to:
RA (J2000.0) = 10 21 35.29
DEC (J2000.0) = +06 19 41.8
with an uncertainty of 1.9 arcsec (radius, 90% containment). This location
is 87.3 arcseconds from the BAT onboard position, inside the BAT error
circle. Analysis of the promptly available data is online at
http://www.swift.ac.uk/sper/1273071 .
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.