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GCN Circular 26515

GRB 191220A: Prompt enhanced Swift-XRT position
2019-12-20T14:02:07Z (4 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 191220A, we find an
enhanced XRT position of the afterglow: RA, Dec: 281.3800, 26.6558
which is equivalent to:
   RA (J2000)  = 18 45 31.19
   Dec (J2000) = +26 39 20.9
with an uncertainty of 2.3 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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