[vsnet-grb-info 17128] GRB 151023A: Enhanced Swift-XRT position
GCN Circulars
gcncirc at capella2.gsfc.nasa.gov
Sat Oct 24 08:11:55 JST 2015
TITLE: GCN CIRCULAR
NUMBER: 18459
SUBJECT: GRB 151023A: Enhanced Swift-XRT position
DATE: 15/10/23 23:09:05 GMT
FROM: Phil Evans at U of Leicester <pae9 at leicester.ac.uk>
P.A. Evans, M.R. Goad, J.P. Osborne and A.P. Beardmore (U. Leicester)
report on behalf of the Swift-XRT team.
Using 1446 s of XRT Photon Counting mode data and 2 UVOT
images for GRB 151023A, 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 = 270.98458, -8.31640 which is equivalent
to:
RA (J2000): 18h 03m 56.30s
Dec (J2000): -08d 18' 59.0"
with an uncertainty of 2.3 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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