TITLE: GCN GRB OBSERVATION REPORT NUMBER: 2969 SUBJECT: GRB050123,optical observation DATE: 05/01/24 08:54:57 GMT FROM: Shouta Maeno at U.of Miyazaki S.Maeno,E.Sonoda,Y.Matsuo,M.Yamauchi (University of Miyazaki) "We have observed the field covering the error box of GRB 050123 (HETE trigger 3666;trigger time 10:22:53 UT) with the unfiltered CCD camera on the 30-cm telescope at University of Miyazaki. The observation was started 17:05:26 UT on Jan.23. Observed field of view is 43 arcmin centerd on R.A.=10h 31m 58s Dec=-11d 26' 00" After co-adding a set of 5 images of 30 sec exposures, we have compared with the USNO A2.0 catalog. Preliminary analysis shows there is no new source brighter than 17.4 mag.