TITLE: GCN CIRCULAR NUMBER: 33016 SUBJECT: GRB 221202A: Swift/UVOT Detection DATE: 22/12/03 21:07:48 GMT FROM: Paul Kuin at MSSL Paul Kuin (MSSL-UCL) and R. Caputo (GSFC) report on behalf of the Swift/UVOT team: The Swift/UVOT began settled observations of the field of GRB 221202A 102 s after the BAT trigger (Caputo et al., GCN Circ. 33005). A source consistent with the XRT position (Beardmore et al. GCN Circ. 33008) is detected in the initial UVOT exposures. 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 102 733 186 20.66 +/- 0.20 v 590 4820 216 >19.9 b 516 709 39 >19.8 u 260 857 285 >19.7 w1 640 832 39 >20.8 m2 615 808 39 >18.1 w2 566 4635 235 >20.0 The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.027 in the direction of the burst (Schlegel et al. 1998).