TITLE: GCN CIRCULAR NUMBER: 7973 SUBJECT: GRB 080710: Optical observation with MITSuME Okayama DATE: 08/07/11 23:35:57 GMT FROM: Michitoshi Yoshida at Okayama Astrophysical Obs M. Yoshida, K. Yanagisawa, D. Kuroda, Y. Shimizu, S. Nagayama, H. Toda (OAO, NAOJ) and N. Kawai (Tokyo Tech) report on behalf of the MITSuME collaboration: We observed the optical afterglow (Li et al. GCN 7959; D'Avanzo et al. GCN 7960; Schady GCN 7961) of GRB 080710 (Sbarufatti et al. GCN 7957) with the optical three color (g', Rc and Ic) imager attached to the MITSuME 50cm telescope of Okayama Astrophysical Observatory. We started the observation at 2008-07-10 15:37:23 UT. Photometric results are listed below. We used four USNO-B1.0 stars around the afterglow. The Rc band magnitude is consistent with the power-law decay with alpha = 1.5 reported by Schulze et al. (GCN 7972). mid-UT of the observation: 2008-07-10 16:27:00 (0.384595 days after trigger) T-T0(days) exp-T g' Rc Ic ---------------------------------------------------------------- 0.384595 86min 18.79 +/- 0.08 18.96 +/- 0.06 18.57 +/- 0.06 ----------------------------------------------------------------