TITLE: GCN CIRCULAR NUMBER: 9747 SUBJECT: GRB 090807, RIMOTS optical upper limits DATE: 09/08/07 16:43:17 GMT FROM: Kenta Kono at Miyazaki U K.Kono, K.Noda, E.Sonoda, N.Ohmori, H.hayasi, A.Daikyuji, Y.Nisioka, M.Yamauchi (University of Miyazaki) We have observed the field covering the error circle of GRB 090807 (Swift trigger 359378, GCN 9746, J. K. Cannizzo et al.) with the unfiltered CCD camera on the 30-cm telescope at University of Miyazaki. The observation was started 15:04:25 UT, about 2.2 min 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 reported position. (GCN 9746, J. K. Cannizzo et al.) the upper limits are as follows: -------------------------------------------------------------- Start(UT) End(UT)   Num. of frames  Limit (mag.) -------------------------------------------------------------- 15:04:25 15:04:55 1 12.6 15:04:25 15:30:26 19 18.5 ---------------------------------------------------------------