TITLE: GCN CIRCULAR NUMBER: 16147 SUBJECT: GRB 140423A: Swift/UVOT detection of a possible counterpart DATE: 14/04/23 10:49:48 GMT FROM: Margaret Chester at PSU M. M. Chester (PSU), E. Sonbas (NASA/GSFC/Adiyaman Univ.), K. L. Page (U Leicester), D. Malesani (DARK/NBI), and S. R. Oates (UCL-MSSL) report on behalf of the Swift/UVOT team: Swift/UVOT took a finding chart exposure of 150 seconds with the White filter starting 2946 seconds after the BAT trigger. A faint source (19.6 +/- 0.4 mag) is detected in the White filter which is consistent with the candidate reported by Elenin et al. (GCN Circ. 16143) but not consistent with the Swift/XRT position reported by D. N. Burrows et al. (GCN Circ. 16146). The separation from the XRT position is 9.6 arcsec. The preliminary UVOT position is RA (J2000) 197.28546 (13:09:08.51) Dec (J2000) 49.84133 (+49:50:28.8) with an estimated uncertainty of 1.1 arcsec (radius, 90% confidence, statistical + systematic). No correction has been made for the expected extinction corresponding to E(B-V) of 0.01.