TITLE:   GCN CIRCULAR
NUMBER:  19988
SUBJECT: GRB 161004B: Prompt enhanced Swift-XRT position
DATE:    16/10/04 23:53:05 GMT
FROM:    Phil Evans at U of Leicester  <pae9@leicester.ac.uk>

P.A. Evans (U. Leicester) reports on behalf of the Swift-XRT team:

Using  promptly downlinked XRT event data for GRB 161004B, we find an
enhanced XRT position of the afterglow: RA, Dec: 112.1514, -39.8976
which is equivalent to:
   RA (J2000)  = 07 28 36.34
   Dec (J2000) = -39 53 51.5
with an uncertainty of 2.0 arcseconds (radius, 90% confidence).
Analysis of the promptly available data is online at
http://www.swift.ac.uk/sper/715246.

Position enhancement is is described by Goad et al. (2007, A&A, 476,
1401) and Evans et al. (2009, MNRAS, 397, 1177).

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