TITLE: GCN CIRCULAR NUMBER: 7522 SUBJECT: GRB 080325: MITSuME Akeno optical upper limits DATE: 08/03/26 07:40:25 GMT FROM: Nobuyuki Kawai at Tokyo Tech Y. Kudou, T. Shimokawabe and N. Kawai (Tokyo Tech) report on behalf of the MITSuME collaboration: We observed the error box of GRB 080325 (L. Vetere et al. GCN 7512) with the 3-color 50cm MITSuME Telescope at Akeno, Japan starting at 16:51:16 Mar 25 UT, 12.7 hr after the trigger under a poor sky condition at a low altitude. In the co-added images of Ic, Rc, and g' bands, we did not detect any afterglow candidate in the XRT error circle. The 3-sigma limiting magnitudes based on USNO-B1.0 (I-band) and NOMAD (R-band,g'-band) stars are following. Filter start time end time Exposure Mag (3-sigma upper limit) ----------------------------------------------------------------- g' 16:51:16 17:54:41 15 x 60 s 17.2 Rc 16:51:16 17:54:41 15 x 60 s 16.4 Ic 16:51:16 17:54:41 15 x 60 s 17.0 -----------------------------------------------------------------