[vsnet-grb-info 5661] GRB 080218B: Enhanced Swift-XRT position

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  7320
SUBJECT: GRB 080218B: Enhanced Swift-XRT position
DATE:    08/02/19 06:16:07 GMT
FROM:    Phil Evans at U of Leicester  <pae9 at star.le.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 311 s of overlapping XRT Photon Counting mode and UVOT
V-band data for GRB 080218B, 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 = 177.95739, -53.09712 which is equivalent
to:

RA (J2000): 11h 51m 49.77s
Dec (J2000): -53d 05' 49.6"

with an uncertainty of 2.4 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
http://www.swift.ac.uk/xrt_positions/Goad.pdf).

This circular was automatically generated, and is an official product of the
Swift-XRT team.