TITLE: GCN CIRCULAR NUMBER: 14268 SUBJECT: GRB 130305A: Swift/UVOT Upper Limit DATE: 13/03/07 12:34:13 GMT FROM: Alice Breeveld at MSSL-UCL A. A. Breeveld (MSSL-UCL), Daniele Malesani (DARK/NBI), Bin-Bin Zhang (PSU), S. R. Oates (MSSL-UCL) and M. De Pasquale (MSSL-UCL) report on behalf of the Swift/UVOT team: The Swift/UVOT began settled observations of the field of GRB 130305A 30975s after the BAT trigger discovered in ground analysis (Cummings et al., GCN Circ. 14257). No optical afterglow consistent with the XRT position (Malesani et al., GCN Circ. 14263) is detected in the initial UVOT exposures. Preliminary 3-sigma upper limit using the UVOT photometric system (Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the initial exposures are: Filter T_start(s) T_stop(s) Exp(s) Mag u 30975 59030 3890 >21.4 The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.05 in the direction of the burst (Schlegel et al. 1998).