GCN Circular 13837
Subject
GRB 121001A: Enhanced Swift-XRT Position
Date
2012-10-02T07:12:24Z (12 years ago)
From
Phil Evans at U of Leicester <pae9@leicester.ac.uk>
P.A. Evans (U. Leicester) reports on behalf of the Swift-XRT team:
Using 2340 s of XRT Photon Counting mode data and 3 UVOT images of GRB
121001A (D'Elia et al., GCN Circ. 13831), 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 = 276.03227, -5.66587
which is equivalent to:
RA (J2000): 18 24 07.74
Dec (J2000): -05 39 57.1
with an uncertainty of 1.8 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.