TITLE: GCN CIRCULAR NUMBER: 16210 SUBJECT: GRB 140502A: Swift/UVOT Upper Limits DATE: 14/05/03 11:43:15 GMT FROM: Samantha Oates at MSSL S. R. Oates (IAA-CSIC,UCL-MSSL) and C. A. Swenson (PSU) report on behalf of the Swift/UVOT team: The Swift/UVOT began settled observations of the field of GRB 140502A 75 s after the BAT trigger (Swenson et al., GCN Circ. 16202). Two bright USNO-B1 sources lie close to the XRT location, with R magnitudes of 13.48 and 13.61, lie within 3 and 9 arcseconds, respectively of the XRT position (Goad et al., GCN Circ. 16206). Neither of these sources are observed to vary significantly over the duration of the initial UVOT observations. Ppreliminary 3-sigma upper limits, using the UVOT photometric system (Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the first finding chart (FC) exposure and subsequent exposures are : Filter T_start(s) T_stop(s) Exp(s) Mag white_FC 75 225 147 >16.0 u_FC 287 537 246 >16.3 white 75 5702 525 >16.0 v 616 6113 432 >15.0 b 543 11919 337 >16.0 u 287 11811 1347 >16.3 w1 666 17270 1642 >17.9 m2 4681 16734 1262 >20.0 w2 593 5908 432 >18.9 The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 2.97 in the direction of the burst (Schlegel et al. 1998).