[vsnet-grb-info 7223] GRB 090111: Enhanced Swift-XRT position
GCN Circulars
gcncirc at capella.gsfc.nasa.gov
Mon Jan 12 13:41:26 JST 2009
TITLE: GCN CIRCULAR
NUMBER: 8796
SUBJECT: GRB 090111: Enhanced Swift-XRT position
DATE: 09/01/12 04:41:17 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 1667 s of XRT Photon Counting mode data and 2 UVOT
images for GRB 090111, 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 = 251.67557, +0.07728 which is equivalent
to:
RA (J2000): 16h 46m 42.14s
Dec (J2000): +00d 04' 38.2"
with an uncertainty of 1.7 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.
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