[vsnet-grb-info 19772] GRB 170903A: Enhanced Swift-XRT position
GCN Circulars
gcncirc at capella2.gsfc.nasa.gov
Mon Sep 4 04:50:16 JST 2017
TITLE: GCN CIRCULAR
NUMBER: 21797
SUBJECT: GRB 170903A: Enhanced Swift-XRT position
DATE: 17/09/03 19:49:46 GMT
FROM: Phil Evans at U of Leicester <pae9 at leicester.ac.uk>
M.R. Goad, J.P. Osborne, A.P. Beardmore and P.A. Evans (U. Leicester)
report on behalf of the Swift-XRT team.
Using 1379 s of XRT Photon Counting mode data and 2 UVOT
images for GRB 170903A, 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 = 254.52613, +34.97887 which is equivalent
to:
RA (J2000): 16h 58m 6.27s
Dec (J2000): +34d 58' 43.9"
with an uncertainty of 1.9 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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