TITLE: GCN CIRCULAR NUMBER: 20177 SUBJECT: GRB 161113A: Swift/UVOT Upper Limits DATE: 16/11/15 13:15:18 GMT FROM: Alice Breeveld at MSSL-UCL A. A. Breeveld (UCL-MSSL), P. D'Avanzo (INAF-OAB) and S. W. K. Emery (UCL-MSSL) report on behalf of the Swift/UVOT team: The Swift/UVOT began settled observations of the field of GRB 161113A 61 s after the BAT trigger (D'Avanzo et al., GCN Circ. 20172). No optical afterglow consistent with the XRT position (Evans et al. GCN Circ. 20174) 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) exposures and subsequent exposures are: Filter T_start(s) T_stop(s) Exp(s) Mag white_FC 61 211 147 >19.8 u_FC 274 483 206 >18.8 white 555 6332 369 >21.0 v 5152 5352 197 >19.2 b 4537 6171 393 >20.1 u 274 5966 599 >19.6 w1 4126 5762 393 >20.1 The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.02 in the direction of the burst (Schlegel et al. 1998).