TITLE:   GCN CIRCULAR
NUMBER:  38116
SUBJECT: EP241107a: SVOM/C-GFT optical observations
DATE:    24/11/07 17:35:15 GMT
FROM:    Chao Wu at NAOC <cwu@nao.cas.cn>

SVOM/C-GFT team: Zhe Kang (CHO), Chao WU (NAOC), Liping Xin(NAOC), Xuhui Han(NAOC), Pinpin Zhang (NAOC), Xiaomeng Lu (NAOC), Zhenwei Li (CHO), You Lv (CHO), Ruosong Zhang (NAOC), Yujie Xiao(NAOC)

SVOM JSWG: Jian-Yan Wei (NAOC), Bertrand Cordier (CEA), Shuang-Nan Zhang (IHEP), Stéphane Basa (LAM), Arnaud Claret (CEA), Zi-Gao Dai (USTC), Frédéric Daigne (IAP), Jin-Song Deng (NAOC),Olivier Godet (IRAP),  Andrea Goldwurm (APC), Diego Götz (CEA), Xu-Hui Han (NAOC), Cyril Lachaud (APC), En-Wei Liang (GXU), Yu-Lei Qiu (NAOC), Susanna Vergani (Obs.Paris), Jing Wang (NAOC), Chao Wu (NAOC), Li-Ping Xin (NAOC),  Shao-Lin Xiong (IHEP), Bing Zhang (UNLV)


We started to observe the field of EP241107a detected by EP-WXT (Zhou et al. GCN 38112) on 2024-11-07T14:15:49 UT, ~ 5.42 mins after the trigger with C-GFT in the commissioning phase. A series of images were obtained with exposure time of 10s. The uncatalogued object reported by Odeh et al. (GCN  38115) was detected in stacked image with mag_i = 17.12 +/-0.10 at ~5.7 mins after the trigger. There is no obviously decay found during ~22 mins observation.  

The photometry was calibrated with nearby PS1 star. 

We thank the observation assistant Yinghuai Hao and Chunlei Guo at Jilin observatory for their excellent support.


Chinese Ground Follow-up Telescope of SVOM mission is located at Jilin, 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.