TITLE: GCN CIRCULAR NUMBER: 16358 SUBJECT: GRB 140606A: Swift/UVOT Upper Limits DATE: 14/06/06 21:40:25 GMT FROM: Frank Marshall at GSFC F. E. Marshall (NASA/GSFC) and M. C. Stroh (PSU) report on behalf of the Swift/UVOT team: The Swift/UVOT began settled observations of the field of GRB 140606A 68 s after the BAT trigger (Stroh et al., GCN Circ. 16353). No optical afterglow consistent with the BAT position (Cummings et al. GCN Circ. 16354) 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 68 218 147 >21.1 u_FC 280 530 246 >20.4 white 68 6243 746 >21.6 v 609 6654 471 >20.2 b 535 6039 269 >20.8 u 280 5834 442 >20.8 w1 833 7064 452 >20.8 m2 1063 6859 413 >20.6 w2 1188 6449 413 >20.8 The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.01 in the direction of the burst (Schlegel et al. 1998).