TITLE: GCN GRB OBSERVATION REPORT NUMBER: 4129 SUBJECT: GRB 051021,optical observation DATE: 05/10/22 09:08:20 GMT FROM: Eri Sonoda at U of Miyazaki/Japan E.Sonoda,S.Maeno,Y.Tokunaga, M.Yamauchi (University of Miyazaki) "We have observed the field covering the SXC error box of GRB051021(HETE trigger 3947; trigger time 13:21:5 UT ) with the unfiltered CCD camera on the 30-cm telescope at University of Miyazaki.The observation was started 13:22:30 UT on Oct.21. We have compared our image with the USNO A2.0 catalog . Preliminary analysis shows there is no new source brighter than 14.3 mag. at the position reported by D.B.Fox et al.(GCN4120). "