GCN Circular 37706
Subject
GRB 241002C: SVOM/C-GFT optical upper limit
Date
2024-10-04T06:03:53Z (6 months ago)
From
Chao Wu at NAOC <cwu@nao.cas.cn>
Via
Web form
SVOM/C-GFT team: Chao WU (NAOC), Zhe Kang (CHO), 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 observed the field of the GRB 241002C (sb24100203) detected by SVOM/ECLAIRs(Chateau et al., GCN 37674) starting at 2024-10-02T15:37:13 UT, ~6.27 hr after the burst trigger with C-GFT (Chinese Ground Follow-up Telescope in SVOM mission) in the commissionig phase. 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. We obtained stacked images of g: 36x30s, r: 36x30s and i: 36x30s. No any uncatalogued optical source detected within the SVOM/ECLAIRs error region down to the limiting magnitude (3 sigma) of mag_g=19.44, mag_r=19.91, and mag_i=19.51 . It is consistent with the results reported by Joshima et al. (GCN 37688) and Page et al. (GCN 37702).
The photometry was calibrated with nearby stars in Pan-STARRS 1 .
We thank the observation assistants Bowen Li and Guangsheng Zhang at Jilin observatory for their excellent support.