[vsnet-grb-info 19819] GRB 170912A: Prompt enhanced Swift-XRT position
GCN Circulars
gcncirc at capella2.gsfc.nasa.gov
Tue Sep 12 11:21:42 JST 2017
TITLE: GCN CIRCULAR
NUMBER: 21862
SUBJECT: GRB 170912A: Prompt enhanced Swift-XRT position
DATE: 17/09/12 02:14:56 GMT
FROM: Phil Evans at U of Leicester <pae9 at leicester.ac.uk>
P.A. Evans (U. Leicester) reports on behalf of the Swift-XRT team:
Using promptly downlinked XRT event data for GRB 170912A, we find an
enhanced XRT position of the afterglow: RA, Dec: 167.3734, -54.3262
which is equivalent to:
RA (J2000) = 11 09 29.61
Dec (J2000) = -54 19 34.4
with an uncertainty of 2.2 arcseconds (radius, 90% confidence).
Analysis of the promptly available data is online at
http://www.swift.ac.uk/sper/772006.
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.
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