[vsnet-grb-info 28383] GRB 210723A: Prompt enhanced Swift-XRT position
GCN Circulars
gcncirc at capella2.gsfc.nasa.gov
Sat Jul 24 00:24:25 JST 2021
TITLE: GCN CIRCULAR
NUMBER: 30486
SUBJECT: GRB 210723A: Prompt enhanced Swift-XRT position
DATE: 21/07/23 15:23:33 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 210723A, we find an
enhanced XRT position of the afterglow: RA, Dec: 121.7213, -32.8851
which is equivalent to:
RA (J2000) = 08 06 53.12
Dec (J2000) = -32 53 06.4
with an uncertainty of 1.9 arcseconds (radius, 90% confidence).
Analysis of the promptly available data is online at
http://www.swift.ac.uk/sper/1061284.
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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