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.
Poole, P. Smith, B. Hancock (MSSL), S. Koch (PSU), M. Carter, H. Huckle
(MSSL), P. Broos (PSU), T. Kennedy (MSSL), J. Racusin (PSU), E. Fenimore
(LANL), B. Zhang (UNLV), J. Nousek (PSU), N. Gehrels (GSFC), on behalf of
the Swift UVOT team.
The Swift Ultra-Violet/Optical Telescope (UVOT) began observations of
GRB050223 at 03:55:28 UT on 23 Feb 2005, about 46:22 UT after the initial
Swift Bat trigger (Mitani et al, GCN 3055). The delay in observations was
due to the Earth-limb constaint, which prevented an immediate slew. We
detect no source in the intial 100s exposure at the Swift XRT position
(Giommi et al, GCN 3054).