TITLE: GCN CIRCULAR NUMBER: 12339 SUBJECT: GRB 110915A: GMG optical upper limit DATE: 11/09/15 17:05:38 GMT FROM: Dong Xu at Weizmann Inst X.-H. Zhao (YNAO), D. Xu (WIS), J.-R. Mao & J.-M. Bai (YNAO) report on a larger collaboration: We observed the XRT field (Evans, GCN 12336) of GRB 110915A (Holland et al., GCN 12335) with the 2.4m GMG telescope in Yunnan, China equipped with YFOSC. Observations started at 13:58:09 UT, 15th Sep. 2011 (i.e., 0.6236 hr after the burst), and 1x20 min R-band and 1x20 min V-band images were obtained under the cloudy weather. No optical source was present within the XRT error circle in GCN #12336, which sets a 3\sigma upper limit of R~21.6 mag, calibrated with the USNO B1 catalog.