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GCN Circular 33688

Subject
GRB 230427A: Enhanced Swift-XRT position
Date
2023-04-27T13:41:28Z (a year ago)
From
Phil Evans at U of Leicester <pae9@star.le.ac.uk>
A.P. Beardmore, P.A. Evans, M.R. Goad and J.P. Osborne (U. Leicester) 
report on behalf of the Swift-XRT team.

Using 1112 s of XRT Photon Counting mode data and 2 UVOT
images for GRB 230427A, 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 = 153.31316, +48.20393 which is equivalent
to:

RA (J2000): 10h 13m 15.16s
Dec (J2000): +48d 12' 14.2"

with an uncertainty of 2.4 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.


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