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GCN Circular 32077

GRB 220521A: Prompt enhanced Swift-XRT position
2022-05-21T23:44:42Z (2 years ago)
Phil Evans at U of Leicester <>
P.A. Evans (U. Leicester) reports on behalf of the Swift-XRT team:

Using  promptly downlinked XRT event data for GRB 220521A, we find an
enhanced XRT position of the afterglow: RA, Dec: 275.22978, 10.37221
which is equivalent to:
   RA (J2000)  = 18 20 55.15
   Dec (J2000) = +10 22 19.9
with an uncertainty of 1.9 arcseconds (radius, 90% confidence).
Analysis of the promptly available data is online at

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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