TITLE: GCN CIRCULAR NUMBER: 18046 SUBJECT: GRB 150722A: Swift/UVOT Upper Limits DATE: 15/07/22 16:38:01 GMT FROM: Paul Kuin at MSSL N. P. M. Kuin (UCL-MSSL) and F. E. Marshall (NASA/GSFC) report on behalf of the Swift/UVOT team: The Swift/UVOT began settled observations of the field of GRB 150722A 3238 s after the BAT trigger (Marshall et al., GCN Circ. 18042). No optical afterglow consistent with the XRT position (Evans et al. GCN Circ. No. 18044) 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 3238 3388 147 >20.6 white 3238 5442 541 >21.6 v 4217 5791 333 >20.0 b 3602 5237 393 >21.0 u 3396 5031 393 >20.6 w1 4627 4827 197 >20.1 m2 4422 4622 197 >20.3 w2 4012 5647 393 >21.4 The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.06 in the direction of the burst (Schlegel et al. 1998).