TITLE: GCN CIRCULAR NUMBER: 28085 SUBJECT: GRB 200711A: Swift/UVOT Upper Limits DATE: 20/07/13 02:22:08 GMT FROM: Kira Simpson at PSU GRB 200711A: Swift/UVOT Upper Limits K. K. Simpson (PSU) and F. E. Marshall (NASA/GSFC) report on behalf of the Swift/UVOT team: The Swift/UVOT began settled observations of the field of GRB 200711A 170 s after the BAT trigger (Marshall et al., GCN Circ. 28078). No optical afterglow consistent with the BAT position (Marshall et al. GCN Circ 28078) 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 170 319 147 >20.2 white 170 999 310 >20.6 v 404 4651 255 >18.7 b 503 868 58 >19.1 u 477 5088 80 >19.0 w1 453 5061 255 >19.3 m2 428 448 19 >18.0 w2 379 4446 255 >19.5 The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.96 in the direction of the burst (Schlegel et al. 1998).