[vsnet-grb-info 7109] GRB 081221: Enhanced Swift-XRT position
GCN Circulars
gcncirc at capella.gsfc.nasa.gov
Mon Dec 22 12:22:24 JST 2008
TITLE: GCN CIRCULAR
NUMBER: 8690
SUBJECT: GRB 081221: Enhanced Swift-XRT position
DATE: 08/12/22 03:22:16 GMT
FROM: Phil Evans at U of Leicester <pae9 at star.le.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 4345 s of XRT Photon Counting mode data and 7 UVOT
images for GRB 081221, 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 = 15.7925, -24.5481 which is equivalent
to:
RA (J2000): 01h 03m 10.20s
Dec (J2000): -24d 32' 53.1"
with an uncertainty of 1.4 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), the current algorithm is an
extension of this method.
This circular was automatically generated, and is an official product of the
Swift-XRT team.
More information about the vsnet-grb-info
mailing list