TITLE: GCN CIRCULAR NUMBER: 16894 SUBJECT: GRB 141005A: Swift/UVOT Upper Limits DATE: 14/10/05 17:20:24 GMT FROM: Paul Kuin at MSSL N. P. M. Kuin (UCL-MSSL) and V. D'Elia (ASDC) report on behalf of the Swift/UVOT team: The Swift/UVOT began settled observations of the field of GRB 141005A 94 s after the BAT trigger (D'Elia et al., GCN Circ. 16882). This GRB was observed also by Fermi GBM (Roberts, GCN Circ. 16889), and in the r and i bands (P60: Perley et al., GCN Circ. 16884, RATIR: Littlejohn et al.,GCN Circ. 16885). A nearby galaxy was reported by Perley et al., and is also seen in the UVOT images. No optical afterglow consistent with the XRT position (Beardmore et al. GCN Circ. 16888), or the P60 position is detected in the initial UVOT exposures, although the event data for the UVOT b-band show a slight brightening peaking around T+700s.. 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 u_FC 94 344 246 >20.1 v 5960 7392 393 >19.4 b 349 6980 639 >20.2 u 94 6775 786 >20.6 w1 5138 6570 393 >19.9 m2 4932 7445 441 >20.2 w2 5754 7186 393 >20.6 The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.17 in the direction of the burst (Schlegel et al. 1998).