TITLE: GCN CIRCULAR NUMBER: 18918 SUBJECT: GRB 160121A: Enhanced Swift-XRT position DATE: 16/01/21 22:44:41 GMT FROM: Phil Evans at U of Leicester J.P. Osborne, A.P. Beardmore, P.A. Evans and M.R. Goad (U. Leicester) report on behalf of the Swift-XRT team. Using 2518 s of XRT Photon Counting mode data and 3 UVOT images for GRB 160121A, we find an astrometrically corrected X-ray position (using the XRT-UVOT alignment and matching UVOT field sources to the USNO-B1 catalogue): RA, Dec = 109.08819, -23.59221 which is equivalent to: RA (J2000): 07h 16m 21.17s Dec (J2000): -23d 35' 32.0" with an uncertainty of 1.6 arcsec (radius, 90% confidence). This position may be improved as more data are received. The latest position can be viewed at http://www.swift.ac.uk/xrt_positions. Position enhancement is described by Goad et al. (2007, A&A, 476, 1401) and Evans et al. (2009, MNRAS, 397, 1177). This circular was automatically generated, and is an official product of the Swift-XRT team.