TITLE: GCN CIRCULAR NUMBER: 41463 SUBJECT: GRB 250821A: Prompt enhanced Swift-XRT position DATE: 25/08/21 11:57:10 GMT FROM: Phil Evans at U of Leicester <pae9@star.le.ac.uk> P.A. Evans (U. Leicester) reports on behalf of the Swift-XRT team: Using 1.6 ks of promptly downlinked XRT event data for GRB 250821A, we find an enhanced XRT position of the afterglow: RA, Dec: 358.44056, -28.65369 which is equivalent to: RA (J2000) = 23 53 45.73 Dec (J2000) = -28 39 13.3 with an uncertainty of 2.9 arcseconds (radius, 90% confidence). Analysis of the promptly available data is online at http://www.swift.ac.uk/sper/1344131. Position enhancement 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. View this GCN Circular online at https://gcn.nasa.gov/circulars/41463. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...