TITLE: GCN GRB OBSERVATION REPORT NUMBER: 3338 SUBJECT: GRB050502B: I band source in XRT error circle DATE: 05/05/03 00:04:58 GMT FROM: Brian Schmidt at RSAA, ANU (MSSSO) Joshua Rich, Brian Schmidt (Australian National University) and Jessie Christiansen (UNSW) report on behalf of a larger collaboration: Images taken with ANU 1m telescope show a source within the SWIFT XRT error circle (Pagani et al., GCN 3333) at I=19.5 located at RA=09:30:10.024 DEC=+16:59:48.07 J2000. This object does not vary by more than +/- 0.1 mag from 2 May 2005 UT 9:58 through to UT 11:05. The object is not detected in V to V>21. The object is 4.01+/-0.1 mag fainter than the star located at RA=09:30:12.616 DEC=+17:00:05.55 in I. This message may be cited.