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GCN Circular 30486

Subject

GRB 210723A: Prompt enhanced Swift-XRT position

Date

2021-07-23T15:23:33Z (3 years ago)

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 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.