GCN Circular 18650
S.W.K Emery (UCL-MSSL) and A. D'Ai (INAF-IASFPA) report on behalf of the Swift/UVOT team: The Swift/UVOT began settled observations of the field of GRB 151127A 77 s after the BAT trigger (D'Ai et al., GCN Circ. 18643). No optical afterglow consistent with the XRT position (Goad et al. GCN Circ. 18647) 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 77 227 147 >20.8 white 77 1017 295 >21.2 w1 668 6559 452 >20.3 m2 816 6354 432 >20.0 w2 594 18458 1696 >21.3 The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.12 in the direction of the burst (Schlegel et al. 1998).