TITLE: GCN CIRCULAR NUMBER: 10261 SUBJECT: GRB 091208A, RIMOTS optical upper limits DATE: 09/12/08 13:40:03 GMT FROM: Kazuhiro Noda at Miyazaki U K.Noda, K.Kono, 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 GRB091208A (Swift trigger 378554, GCN 10253, Hoversten et al.) with the unfiltered CCD camera on the 30-cm telescope at University of Miyazaki. The observation was started 09:04:56 UT, about 19 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. the upper limits are as follows: -------------------------------------------------------------- Start(UT) End(UT) Num. of frames Limit (mag.) -------------------------------------------------------------- 09:04:56 09:05:26 1 15.8 09:04:56 09:48:39 33 17.3 ---------------------------------------------------------------