TITLE: GCN CIRCULAR NUMBER: 31349 SUBJECT: GRB 220101A: Enhanced Swift-XRT position DATE: 22/01/01 08:34:16 GMT FROM: Phil Evans at U of Leicester pae9@leicester.ac.uk
J.P. Osborne, A.P. Beardmore, P.A. Evans and M.R. Goad (U. Leicester) report on behalf of the Swift-XRT team.
Using 1177 s of XRT Photon Counting mode data and 3 UVOT images for GRB 220101A, 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 = 1.35374, +31.76890 which is equivalent to:
RA (J2000): 00h 05m 24.90s Dec (J2000): +31d 46' 08.0"
with an uncertainty of 2.1 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.