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GCN Circular 9567

Subject
GRB 090621A: Enhanced Swift-XRT position
Date
2009-06-24T09:24:00Z (15 years ago)
From
Kim Page at U.of Leicester <kpa@star.le.ac.uk>
K.L. Page, P.A. Evans and M.R. Goad (U. Leicester) report
on behalf of the Swift-XRT team:

Using 5877 s of XRT Photon Counting mode data and 11 UVOT
images, 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 = 11.02150, 61.94110 which is equivalent to:

RA (J2000):  00 44 5.16
Dec (J2000): +61 56 28.0

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) and Evans
et al. (2009, arXiv:0812.3662).

This circular is an official product of the Swift-XRT team.
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