TITLE: GCN CIRCULAR NUMBER: 29026 SUBJECT: GRB 201209A: Swift/UVOT Upper Limits DATE: 20/12/11 13:01:06 GMT FROM: Kira Simpson at PSU GRB 201209A: Swift/UVOT Upper Limits K. K. Simpson (PSU) and J. D. Gropp (PSU) report on behalf of the Swift/UVOT team: The Swift/UVOT began settled observations of the field of GRB 201209A 121 s after the BAT trigger (Gropp et al., GCN Circ. 29005). No optical afterglow consistent with the XRT position (Goad et al. GCN Circ. 29009) 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 121 271 147 >20.1 u_FC 334 584 246 >20.3 white 121 1706 412 >20.9 v 663 1583 117 >19.2 b 590 1682 117 >19.5 u 334 1657 343 >20.7 w1 712 1632 97 >19.8 m2 688 1260 39 >19.2 w2 1018 1211 39 >19.4 The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.04 in the direction of the burst (Schlegel et al. 1998).