TITLE: GCN CIRCULAR NUMBER: 11472 SUBJECT: GRB 101219A: Swift/UVOT Upper Limits DATE: 10/12/19 13:49:14 GMT FROM: Paul Kuin at MSSL N.P.M. Kuin (MSSL/UCL) and J.M. Gelbord (PSU) report on behalf of the Swift/UVOT team: The Swift/UVOT began settled observations of the field of GRB 101219A 67 s after the BAT trigger (Gelbord et al., GCN Circ. 11461). No optical afterglow consistent with the XRT position is detected in the initial UVOT exposures. Preliminary 3-sigma upper limits using the UVOT photometric system (Poole et al. 2008, MNRAS, 383, 627) for the first finding chart (FC) exposure and subsequent exposures are: Filter T_start(s) T_stop(s) Exp(s) Mag white_FC 67 217 147 >20.8 u_FC 279 528 246 >19.9 white 67 5557 467 >21.4 v 608 5968 432 >19.7 b 534 6724 369 >20.3 u 279 6582 658 >20.5 w1 658 6377 432 >21.0 m2 632 6172 432 >20.2 w2 584 5763 432 >20.9 The values quoted above 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).