TITLE: GCN CIRCULAR NUMBER: 14950 SUBJECT: GRB 130627B: Swift/UVOT Upper Limits DATE: 13/06/28 21:31:13 GMT FROM: Paul Kuin at MSSL N. P. M. Kuin and S. R. Oates (UCL-MSSL) report on behalf of the Swift/UVOT team: The Swift/UVOT began settled observations of the field of GRB 130627B 3755 s after the BAT trigger (Oates et al., GCN Circ. No. 14936 and 14939). No optical afterglow consistent with the XRT position Evans et al. GCN Circ. No. 14947 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 3755 3905 147 >20.3 white 3755 5137 344 >20.9 v 3911 5474 320 >19.5 b 4733 4932 197 >20.1 u 4526 4726 197 >19.7 w1 4321 11240 757 >20.3 m2 4116 10664 1082 >20.4 w2 5143 5343 197 >19.7 The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.40 in the direction of the burst (Schlegel et al. 1998).