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GCN Circular 33572

Subject

GRB 230405B: Prompt enhanced Swift-XRT position

Date

2023-04-05T20:37:19Z (2 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 230405B, we find an
enhanced XRT position of the afterglow: RA, Dec: 271.44100, -47.06977
which is equivalent to:
   RA (J2000)  = 18 05 45.84
   Dec (J2000) = -47 04 11.2
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/1163119.

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.