TITLE: GCN CIRCULAR NUMBER: 5830 SUBJECT: GRB061121, optical observation DATE: 06/11/21 21:25:22 GMT FROM: Eri Sonoda at U of Miyazaki/Japan E. Sonoda, S. Maeno, T. Hara, T. Matsumura, K. Tanaka, H. Tanaka, M. Yamauchi (University of Miyazaki) We have observed the field covering the error circle of GRB061121 (GCN 5823) with the unfiltered CCD camera on the 30-cm telescope at University of Miyazaki. The observation was started 18:09:09 UT, 2.77 hour after the Swift trigger time. We have compared our data of 30 sec exposures with the USNO-A2.0 catalog, there is no new source at the position reported by K. L. Page et al.(GCN 5823) The upper limits are as follows: -------------------------------------------------------------- Start(UT) End(UT) Num. of frames Limit (mag.) -------------------------------------------------------------- 18:09:09 18:24:29 9 ~17 18:25:11 19:12:44 29 ~17.2 ---------------------------------------------------------------