{
  "submittedHow": "web",
  "editedBy": "Judith Racusin at NASA/GSFC <judith.racusin@nasa.gov> on behalf of SVOM_group <svomgroup@bao.ac.cn>",
  "body": "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:\n\nWe 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. \n\nThe 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 with the mid time of 62 sec after the burst. \n\nThe photometry was calibrated with nearby Pan-STARRS1 stars. Further observation and analysis is on-going.\n\nWe thank the observation assistants Shuai lui and Guangsheng Zhang  at Jilin observatory for their excellent support.\n\n\nChinese 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.\n\n",
  "version": 2,
  "bibcode": "2025GCN.40029....1W",
  "eventId": "GRB 250403A",
  "format": "text/plain",
  "createdOn": 1743700135320,
  "submitter": "SVOM_group <svomgroup@bao.ac.cn>",
  "circularId": 40029,
  "editedOn": 1743700904814,
  "subject": "GRB 250403A: SVOM/C-GFT optical observations"
}