TITLE: GCN CIRCULAR NUMBER: 16540 SUBJECT: GRB 140703A: Swift/UVOT Upper Limits DATE: 14/07/07 23:45:44 GMT FROM: Mike Siegel at PSU/Swift MOC M. H. Siegel (PSU) and D. Kocevski (NASA/GSFC/ORAU) report on behalf of the Swift/UVOT team: The Swift/UVOT began settled observations of the field of GRB 140703A 123 s after the BAT trigger (Kocevski et al., GCN Circ. 16503). No optical afterglow consistent with the XRT position (Kocevski et al. GCN Circ. 16503) is detected in the initial UVOT exposures. Preliminary 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 123 239 114 >19.7 white 123 5830 507 >20.5 v 4606 4806 197 >19.3 b 3991 5626 393 >20.2 u 3785 5420 393 >20.1 w1 5016 5216 197 >19.7 m2 4811 5010 197 >20.2 w2 4401 6002 359 >20.7 The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.10 in the direction of the burst (Schlegel et al. 1998).