GCN Circular 12070
F. E. Marshall (NASA/GSFC) reports on behalf of the Swift/UVOT team: The Swift/UVOT began settled observations of the field of GRB 110610A 4561 s after the BAT trigger (Marshall et al., GCN Circ. 12065). No optical afterglow consistent with the XRT position (Goad et al. GCN Circ. 12069) is detected in the initial UVOT exposures. The usual UVOT finding chart exposures were not taken because of a nearby bright star. Preliminary 3-sigma upper limits using the UVOT photometric system (Poole et al. 2008, MNRAS, 383, 627) for the initial exposures are: Filter T_start(s) T_stop(s) Exp(s) Mag v 4561 6408 590 >19.7 w1 4971 6817 590 >20.5 m2 4766 6612 590 >20.8 w2 4356 6203 590 >20.5 The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.44 in the direction of the burst (Schlegel et al. 1998).