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GCN Circular 14421

Subject
GRB 130420B: Enhanced Swift-XRT position
Date
2013-04-20T19:47:34Z (11 years ago)
From
Kim Page at U.of Leicester <klp5@leicester.ac.uk>
K.L. Page, P.A. Evans and M.R. Goad (U. Leicester) report
on behalf of the Swift-XRT team:

Using 1436 s of XRT Photon Counting mode data and 3 UVOT images, 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 =
183.12805, 54.39054 which is equivalent to:

RA (J2000):  12 12 30.73
Dec (J2000): +54 23 25.9

with an uncertainty of 2.0 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 is an official product of the Swift-XRT team.
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