TITLE: GCN GRB OBSERVATION REPORT NUMBER: 3287 SUBJECT: GRB 050416: Mitsume optical observation DATE: 05/04/17 13:53:02 GMT FROM: Nobuyuki Kawai at Tokyo Tech K. Yanagisawa (OAO/NAO), H. Toda, and N. Kawai (Tokyo Tech) report on behalf of the Mitsume Collaboration: "The field of GRB050416 (Sakamoto et al.; GCN 3264) was observed by the 3-color Mitsume 50cm Telescope at Okayama, Japan starting at 13:27 (UT). With the first 60 min exposure, we did not detect a source brighter than V=18.0, R=19.6, and I=19.0 at the position of the afterglow reported by Cenko and Fox (GCN 3265)."