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GCN Circular 23280

GRB 180930A: Prompt enhanced Swift-XRT position
2018-09-30T13:42:51Z (6 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 180930A, we find an
enhanced XRT position of the afterglow: RA, Dec: 76.8633, -25.1169
which is equivalent to:
   RA (J2000)  = 05 07 27.19
   Dec (J2000) = -25 07 00.8
with an uncertainty of 2.0 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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