TITLE: GCN GRB OBSERVATION REPORT NUMBER: 3069 SUBJECT: GRB050215B: Late-Time Swift UVOT Observations DATE: 05/03/03 20:17:31 GMT FROM: Pete Roming at PSU 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), A. Blustin (MSSL), S. Koch (PSU), M. Carter, H. Huckle (MSSL), P. Broos (PSU), T. Kennedy, P. Smith, B. Hancock (MSSL), M. Chester (PSU), B. Zhang (UNLV), J. Nousek (PSU), N. Gehrels (GSFC), on behalf of the Swift UVOT team. The Swift Ultra-Violet/Optical Telescope (UVOT) observed the field of the X-ray flash GRB050215B (GCN 3024) between February 25, 2005 and February 28, 2005 UT. The 5-sigma limiting magnitudes for each exposure are presented below. We stress that the limiting magnitudes are based on ground calibrations and are uncertain by approximately +/-0.5 mag. # Exposure # Date (UTC) Time Time (s) Filter Mag 2005-02-25 15:13:13 1670.52 V 22.2 2005-02-25 19:52:34 2189.47 B 23.0 2005-02-25 21:32:35 2068.95 U 22.7 2005-02-25 23:27:38 985.24 V 21.9 2005-02-26 02:34:31 1351.94 V 22.0 2005-02-27 15:20:04 2099.11 B 22.9 2005-02-28 01:07:03 1620.44 V 22.2 2005-02-28 10:40:04 1919.99 B 22.9 We find no evidence for a brightening source, such as a supernova component, at the location of the afterglow seen by UKIRT (GCN 3031).