TITLE: GCN CIRCULAR NUMBER: 24159 SUBJECT: GRB 190422A: Swift/UVOT Upper Limits DATE: 19/04/23 17:30:19 GMT FROM: Kira Simpson at PSU GRB 190422A: Swift/UVOT Upper Limits K. K. Simpson (PSU) and M. J. Moss (George Washington University) report on behalf of the Swift/UVOT team: The Swift/UVOT began settled observations of the field of GRB 190422A 532 s after the BAT trigger (Moss et al., GCN Circ. 24147). No optical afterglow consistent with the XRT position (Evans et al. GCN Circ. 24151) 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 532 682 147 >18.8 white 532 7906 647 >18.8 v 689 6879 352 >17.2 b 788 7700 352 >18.3 u 763 7495 352 >18.9 w1 738 7289 352 >19.1 m2 713 7084 352 >19.1 w2 838 7995 438 >19.6 The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 1.58 in the direction of the burst (Schlegel et al. 1998).