TITLE: GCN CIRCULAR NUMBER: 16324 SUBJECT: GRB 140523A: possible X-ray afterglow candidate from tiled Swift/XRT observations DATE: 14/05/24 07:51:23 GMT FROM: Valerio D'Elia at ASDC V. D'Elia (ASDC) and L. Izzo (URoma/ICRA) report on behalf of the Swift/XRT Team: Swift began a series of observations, tiled on the sky, of the Fermi/GBM and /LAT GRB 140523A (von Kienlin et al. GCN 16321, Vianello et al. GCB 16322). Observations cover four contiguous fields, starting on May 23 at 18:34 UT, i.e., 15.5 h after the GBM detection. Each field was observed for about 2 ks. A possible XRT candidate counterpart for the GBM/LAT source is detected at Ra, Dec 133.111250, +24.957111, which is equivalent to: Ra(J2000) = 08h 52m 26.7s Dec(J2000) = +24d 57' 25.6" with an uncertainty of 6.4" (S/N~3). This location is 10.3 arcmins from the LAT position, within the LAT error box. No statement about fading can be made at this stage. We note the presence of a SDSS galaxy (r=22.27) a few arcsec SW to the center of the XRT detection, consistent with the X-ray position.