TITLE: GCN CIRCULAR NUMBER: 20682 SUBJECT: GRB 170214A: Swift/UVOT Upper Limits DATE: 17/02/16 07:17:01 GMT FROM: Alice Breeveld at MSSL-UCL A. A. Breeveld (UCL-MSSL) and A.P. Beardmore (U. Leicester) report on behalf of the Swift/UVOT team: The Swift/UVOT began settled observations of the field of GRB 170214A 38603 s after the LAT trigger (Mailyan and Meegan, GCN Circ. 20675). No optical afterglow consistent with the XRT’s source 1 position (Beardmore et al., GCN Circ. 20679, Troja et al., GCN Circ. 20681) is detected in the initial UVOT exposures. The source 3 position is just off the edge of the field of view. Preliminary 3-sigma upper limits using the UVOT photometric system (Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for source 1 in the initial exposures are: Filter T_start(s) T_stop(s) Exp(s) Mag w1 38603 65287 4856 >21.0 The magnitude in the table is not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.36 in the direction of the burst (Schlegel et al. 1998).