TITLE: GCN GRB OBSERVATION REPORT NUMBER: 3079 SUBJECT: GRB 050306: CORRECTION to date of observation DATE: 05/03/08 20:00:52 GMT FROM: Patricia Schady at MSSL/Swift A. Blustin (MSSL), P. Brown (PSU), S. Rosen, K. McGowan, M. De Pasquale (MSSL), P. Boyd (GSFC/UMBC), S. T. 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. Poole (MSSL), C. Gronwall (PSU), B. Hancock (MSSL), S. Koch (PSU), M. Carter, H. Huckle (MSSL), P. Broos (PSU), T. Kennedy, P. Smith (MSSL), J. Nousek (PSU), N. Gehrels (GSFC), on behalf of the Swift UVOT team. The Swift Ultra-Violet/Optical Telescope (UVOT) began observations of GRB050306 (GCN 3071) on March 7th, 2005 at 14:58:53 UT. Before this time GRB 050306 was within the Swift Moon avoidance angle. Over an 8,630s exposure combined from four snapshots between 35 and 41 hours after the trigger, we detect no new or variable source down to a V magnitude of 21.2 (5-sigma upper limit) in the BAT error circle. This includes the position of the X-ray candidate reported in GCN 3072.