GCN Circular 36166
Subject
GRB 240418A: Enhanced Swift-XRT position
Date
2024-04-19T00:11:49Z (6 months ago)
From
Phil Evans at U of Leicester <pae9@star.le.ac.uk>
Via
email
P.A. Evans, M.R. Goad, J.P. Osborne and A.P. Beardmore (U. Leicester)
report on behalf of the Swift-XRT team.
Using 463 s of XRT Photon Counting mode data and 1 UVOT
images for GRB 240418A, we find an astrometrically corrected X-ray
position (using the XRT-UVOT alignment and matching UVOT field sources
to the USNO-B1 catalogue): RA, Dec = 239.37529, +23.59582 which is equivalent
to:
RA (J2000): 15h 57m 30.07s
Dec (J2000): +23d 35' 45.0"
with an uncertainty of 3.6 arcsec (radius, 90% confidence).
This position may be improved as more data are received. The latest
position can be viewed at http://www.swift.ac.uk/xrt_positions. Position
enhancement is described by Goad et al. (2007, A&A, 476, 1401) and Evans
et al. (2009, MNRAS, 397, 1177).
This circular was automatically generated, and is an official product of the
Swift-XRT team.