TITLE: GCN CIRCULAR NUMBER: 36841 SUBJECT: EP240708a: SVOM/C-GFT optical upper limit DATE: 24/07/10 14:15:39 GMT FROM: Chao Wu at NAOC <wuchao.lamost@gmail.com> Chao Wu (NAOC), Xuhui Han (NAOC), Zhe Kang (CHO), Liping Xin (NAOC), Pinpin Zhang (NAOC)，Xiaomeng Lu (NAOC), Zhenwei Li (CHO)，Ruosong Zhang (NAOC)，Yujie Xiao(NAOC), Yulei Qiu (NAOC)，You Lv (CHO)，Jing Wang(GXU/NAOC), and Jianyan Wei (NAOC) on behalf of SVOM GRB team We observed the field of the fast X-ray transient EP240708a (Chen et al., GCN 36838) on 18:00:53 UT, July, 9th, 2024, about 18.54 hours after the Einstein Probe (EP) mission trigger with C-GFT (Chinese Ground Follow-up Telescope in SVOM mission) in System Test Mode (STM). C-GFT is located at Jilin (long.=126.33 deg, lat.= 43.8243778 deg), Changchun Observatory, National Astronomical Observatories, CAS. It has FOV of 1.28 deg X 1.28 deg with a 4k*4k CMOS detector mounted on the primary focus of 1.2-meter-aperure telescope. A series of g ,r,and i band images were obtained. The exposure time was 12*10 seconds for each band. No optical afterglow was detected within the enhanced FXT error box (Hu et al., GCN 36840) down to a limit magnitude of 18.2,18.9 and 18.9 for g,r,and i band respectively, which was consistent with the report (Lai et al., 36839; ) at a similar time range. The photometry was calibrated with nearby UCAC 4 catalogs. We thank the observation assistant Guangsheng Zhang at Jilin observatory for their excellent support. View this GCN Circular online at https://gcn.nasa.gov/circulars/36841. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...