TITLE:   GCN CIRCULAR
NUMBER:  21309
SUBJECT: GRB 170710A: Prompt enhanced Swift-XRT position
DATE:    17/07/10 01:33:45 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 170710A, we find an
enhanced XRT position of the afterglow: RA, Dec: 231.8199, -38.4852
which is equivalent to:
   RA (J2000)  = 15 27 16.77
   Dec (J2000) = -38 29 06.6
with an uncertainty of 2.3 arcseconds (radius, 90% confidence).
Analysis of the promptly available data is online at
http://www.swift.ac.uk/sper/761119.

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.