TITLE: GCN GRB OBSERVATION REPORT NUMBER: 3052 SUBJECT: GRB050219b: CORRECTION to time of UVOT observations DATE: 05/02/21 20:34:24 GMT FROM: Patricia Schady at MSSL/Swift T. Poole (MSSL), C. Gronwall (PSU), A. Blustin (MSSL), P. Brown (PSU), S. Rosen, K. McGowan, M. De Pasquale (MSSL), P. Boyd (GSFC/UMBC), S. Holland, M. Still (GSFC/USRA), W. Landsman (GSFC), S. Hunsberger (PSU), A. Breeveld (MSSL), P. Roming (PSU), K. Mason, P. Schady (MSSL), M. Ivanushkina (PSU), T. Kennedy, P. Smith, B. Hancock (MSSL), S. Koch (PSU), M. Carter, H. Huckle (MSSL), P. Broos, J. Racusin (PSU), E. Fenimore (LANL), B. Zhang (UNLV), J. Nousek (PSU), N. Gehrels (GSFC), on behalf of the Swift UVOT team. CORRECTION: The time at which the UVOT began observations of GRB050219b should read as 21:57:51 in GCN 3046 and GCN 3050. This was 52 minutes after the initial Swift BAT trigger (Cummings et al, GCN 3044), the delay being caused by the Earth-limb constraint. No new source was detected at the corrected XRT position (Racusin et al, GCN 3049), and the 3-sigma limiting magnitudes given in GCN 3050 still apply: Filter Lim_Mag Tot_Exposure(s) T_start (s) UVW2 ~ 22.16 1154 T+3120 UVM2 ~ 22.24 1435 T+3243 UVW1 ~ 22.23 940 T+3349 U ~ 20.74 100 T+3455 B ~ 20.9 100 T+3561 V ~ 19.41 100 T+3136 We caution that the instrument is not yet fully calibrated and that the magnitude limits presented here may need to be refined.