TITLE: GCN CIRCULAR NUMBER: 9936 SUBJECT: GRB090926A: UVOT-enhanced XRT position DATE: 09/09/27 00:26:28 GMT FROM: Loredana Vetere at PSU L. Vetere (PSU), P.A. Evans and M.R. Goad (U. Leicester) report on behalf of the Swift-XRT team: Using 3190 s of XRT Photon Counting mode data and 4 UVOT images, 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 =353.40070, -66.32390 which is equivalent to: RA (J2000): 23 33 36.18 Dec (J2000): -66 19 25.9 with an uncertainty of 1.5 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 is an official product of the Swift-XRT team.