TITLE: GCN GRB OBSERVATION REPORT NUMBER: 2807 SUBJECT: GRB 041015: Optical limit at Osaka University DATE: 04/10/15 16:58:27 GMT FROM: Ken ichi Torii at RIKEN K. Torii and Yuuichi Fukazawa (Osaka University) report: The entire error region of GRB 041015 (Mereghetti, et al., GCN 2805) was observed with the 14-inch Automated Response Telescope at Osaka University. The observation started at 2004 October 15 13:08:48 UT (59-s after the IBAS packet time) and 60-s integration was repeated. We stacked 20 unfiltered images obtained between 13:10 and 13:31 UT and compared it with the USNO-A2.0(R) catalog. No new source brighter than R~17.7 mag was identified. ===