TITLE: GCN CIRCULAR NUMBER: 13248 SUBJECT: GRB 120422A: A Swift/UVOT Detection DATE: 12/04/22 18:23:37 GMT FROM: Paul Kuin at MSSL N. P. M. Kuin (MSSL-UCL) and E. Troja (NASA/GSFC/ORAU) report on behalf of the Swift/UVOT team: The Swift/UVOT began settled observations of the field of GRB 120422A 104 s after the BAT trigger (Troja et al., GCN Circ. 13243). A source consistent with the XRT position (Beardmore et al., GCN Circ. 13247) is detected in the summed UVOT exposures at position: RA (J2000) = 136.91012 deg. = 09:07:38.4 Dec (J2000) = +14.018782 deg. = +14:01:07.6 with an estimated uncertainty of 1". Preliminary detections and 3-sigma upper limits using the UVOT photometric system (Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the early exposures are: Filter T_start(s) T_stop(s) Exp(s) Mag white_FC 104 254 147 20.39 +/- 0.27 white 857 1007 147 20.51 +/- 0.29 white 5251 6888 393 20.25 +/- 0.15 v 5662 5862 1082 >19.4 b 5047 6683 393 >20.7 u 262 512 246 19.89 +/- 0.32 u 4842 6478 393 20.00 +/- 0.31 w1 4637 12807 1039 19.84 +/- 0.18 m2 5867 6067 197 19.21 +/- 0.28 m2 11245 12145 886 19.36 +/- 0.14 w2 5457 7032 332 18.98 +/- 0.16 The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.03 in the direction of the burst (Schlegel et al. 1998).