TITLE: GCN CIRCULAR NUMBER: 16820 SUBJECT: GRB 140916A: Prompt enhanced Swift-XRT position DATE: 14/09/16 11:25:31 GMT FROM: 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 140916A, we find an enhanced XRT position of the afterglow: RA, Dec: 40.3999, -39.6865 which is equivalent to: RA (J2000) = 02 41 35.98 Dec (J2000) = -39 41 11.4 with an uncertainty of 2.0 arcseconds (radius, 90% confidence). Analysis of the promptly available data is online at http://www.swift.ac.uk/sper/612804. 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.