TITLE: GCN CIRCULAR NUMBER: 14949 SUBJECT: GRB 130627A: Swift/UVOT Upper Limits DATE: 13/06/28 21:31:12 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 130627A 2979 s after the BAT trigger (Oates et al., GCN Circ. 14933, GCN Circ 14934). No optical afterglow consistent with the (enhanced) XRT position (Kennea et al. GCN Circ. 14935; Osborne et al. GCN Circ. 14945) 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 2979 3129 147 >20.5 white 2979 10701 1229 >22.1 v 3136 4772 393 >19.7 b 3956 9788 1125 >21.3 u 3751 5386 393 >20.5 w1 3546 5182 393 >20.4 m2 3341 4976 393 >20.4 w2 4367 11202 684 >21.2 The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.09 in the direction of the burst (Schlegel et al. 1998).