TITLE: GCN GRB OBSERVATION REPORT NUMBER: 3214 SUBJECT: GRB 050408: WIDGET simultaneous optical observations DATE: 05/04/10 10:38:01 GMT FROM: Toru Tamagawa at RIKEN T. Tamagawa, Y. Urata (RIKEN), F. Usui (ISAS/JAXA), K. Onda, K. Abe, M. Tashiro (Saitama-U) on bealf of the WIDGET collaboration report: "The very widefield camera, WIDGET, located at Akeno, Japan, observed the region of HETE-2 error box for GRB 050408 (GCN 3189, Sakamoto et al.). We continuously monitored the HETE-2 field-of-view with repeat of unfiltered 5 sec exposures from 5 hours before the burst time to 4 hours after it. We have not found any optical emission at the afterglow position reported by Postigo et al. (GCN 3192) during our observation period. Coadding the ten images around the burst time yields the 1-sigma limiting magnitude of R~11 listed below, which was calibrated relative to USNO B1.0 catalogue. t-t0 (sec) start end limit mag. ------------------------------------- -293.93 -198.93 10.9 -193.93 -98.93 10.9 -93.93 1.07 10.9 6.07 101.07 11.0 106.07 201.07 10.9 ------------------------------------- Further analysis is in progress. This message may be cited. http://cosmic.riken.jp/grb/widget/"