GCN Circular 14556
A. A. Breeveld (MSSL-UCL) and J. R. Cummings (GSFC/UMBC) report on behalf of the Swift/UVOT team: The Swift/UVOT began settled observations of the field of GRB 130504A 89s after the BAT trigger (Cummings et al., GCN Circ. 14551), but the GRB position is outside the field of view for several exposures. No optical afterglow consistent with the XRT position (D'Avanzo et al. GCN Circ. 14553) 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 u filter finding chart (FC) exposure and subsequent exposures are: Filter T_start(s) T_stop(s) Exp(s) Mag u_FC 301 551 246 >19.8 white 858 1008 147 >20.5 w1 680 6058 333 >20.2 m2 655 7093 356 >20.4 w2 606 6878 549 >20.8 The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 3.22 in the direction of the burst (Schlegel et al. 1998).