GCN Circular 22218
Subject
GRB 171209A: Enhanced Swift-XRT position
Date
2017-12-09T19:57:15Z (7 years ago)
From
Paolo D'Avanzo at INAF-OAB <paolo.davanzo@brera.inaf.it>
P. D���Avanzo, A. Melandri (INAF-OAB), J. A. Kennea (PSU), P.A. Evans
and M.R. Goad (U. Leicester) report on behalf of the Swift-XRT team:
Using 2454 s of XRT Photon Counting mode data and 6 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 = 139.40280, -30.52016 which is equivalent to:
RA (J2000): 09 17 36.67
Dec (J2000): -30 31 12.6
with an uncertainty of 1.7 arcsec (radius, 90% confidence).
This position is consistent with the one reported for the Swift/UVOT
candidate (LaPorte et al., GCN 22213).
This position may be improved as more data are received. The latest
position can be viewed at http://www.swift.ac.uk/xrt_positions <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.