TITLE: GCN CIRCULAR NUMBER: 16618 SUBJECT: GRB 140719A: Swift/UVOT Upper Limits DATE: 14/07/21 21:41:59 GMT FROM: Frank Marshall at GSFC F. E. Marshall (NASA/GSFC) and R. L. C. Starling (U. Leicester) report on behalf of the Swift/UVOT team: The Swift/UVOT began settled observations of the field of GRB 140719A 83 s after the BAT trigger (Starling et al., GCN Circ. 16606). No optical afterglow consistent with the optical position (Bolmer et al. GCN Circ. 16611) or the enhanced XRT position (Evans et al. GCN Circ. 16607) is detected in the initial UVOT exposures. Nearby bright sources in this crowded field make estimating the background more difficult than usual. 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 83 233 147 >20.9 u_FC 296 546 246 >20.2 white 83 1026 334 >21.3 v 626 4558 178 >19.2 b 552 745 39 >19.5 u 296 720 265 >20.2 w1 676 870 39 >19.0 m2 651 845 39 >21.0 w2 602 1052 58 >19.0 The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.14 in the direction of the burst (Schlegel et al. 1998).