TITLE: GCN CIRCULAR NUMBER: 40029 SUBJECT: GRB 250403A: SVOM/C-GFT optical observations DATE: 25/04/03 17:08:55 GMT FROM: SVOM_group svomgroup@bao.ac.cn
Chao WU (NAOC), Liping Xin(NAOC), Zhe Kang (CHO), Xuhui Han(NAOC), Pinpin Zhang (NAOC), Xiaomeng Lu (NAOC), Zhenwei Li (CHO), You Lv (CHO), Ruosong Zhang (NAOC), Yujie Xiao(NAOC), Yulei, Qiu(NAOC), Jing Wang(NAOC), Jianyan Wei (NAOC), Y. Julakanti, R. A. J. Eyles-Ferris (U. Leicester) report on behalf of the SVOM/C-GFT team:
We observed the field of GRB 250403A detected by FERMI/GBM(FERMI team: GCN 40025) and SVOM/ECLAIRs/GRM (sb25040305, Julakanti et al., GCN 40026)with C-GFT. Our observations were started on 2025-04-03T15:16:17 UTC, ~57s after the trigger.
The optical counterpart (reported by Starling et al., GCN 40028) was clearly detected in our images. Its brightness is 15.60 +/- 0.13 mag in i band at 62 sec after the burst.
The photometry was calibrated with nearby Pan-STARRS1 stars. Further observation and analysis is on-going.
We thank the observation assistants Shuai lui and Guangsheng Zhang 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.
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