TITLE:   GCN GRB OBSERVATION REPORT
NUMBER:  3057
SUBJECT: GRB050223: No Swift UVOT Detection of Afterglow Emission
DATE:    05/02/23 09:00:57 GMT
FROM:    Patricia Schady at MSSL/Swift  <ps@mssl.ucl.ac.uk>

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).