TITLE: GCN CIRCULAR NUMBER: 30529 SUBJECT: GRB 210724A: Swift/UVOT Upper Limits DATE: 21/07/27 06:17:13 GMT FROM: Sam LaPorte at PSU GRB 210724A: Swift/UVOT Upper Limits S. J. LaPorte (PSU) and P. D'Avanzo (INAF-OAB) report on behalf of the Swift/UVOT team: The Swift/UVOT began settled observations of the field of GRB 210724A 125 s after the BAT trigger (D'Avanzo et al., GCN Circ. 30497). No optical afterglow consistent with the XRT position (D'Avanzo et al. GCN Circ. 30497) 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 125 275 147 >20.8 u_FC 283 513 226 >20.1 white 125 275 147 >20.8 u 283 513 227 >20.1 The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.097 in the direction of the burst (Schlegel et al. 1998).