{
  "bibcode": "2025GCN.39555....1W",
  "circularId": 39555,
  "createdOn": 1740979279921,
  "body": "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), Yulei, Qiu(NAOC), Jing Wang(NAOC), Jianyan Wei (NAOC) report on behalf of the SVOM/C-GFT team:\n\n\nWe observed the field of EP250302a detected by Einstein Probe (Trigger ID: 01709132186) with C-GFT. Our observations were started on 2025-03-02T15:43:07 UTC, ~7.05 mins after the trigger. The optical counterpart (reported by Zhu et al. GCN 39550, Busmann et al., GCN 9551,Leonini et al., GCN 39553) was clearly detected in stacked images of band g,r and i. The results are,\n\n(T-T0)_mid(sec)   mag  mag_err  band\n------------------------------------------\n 462            18.13  +/- 0.10  i   \n 553            18.31  +/- 0.09  g  \n 664            18.14  +/- 0.07  r  \n\nThe photometry was calibrated with nearby Pan-STARRS1 stars. Further analysis is on-going.\n\nWe thank the observation assistants Bowen Li  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",
  "subject": "EP250302a: SVOM/C-GFT optical observations",
  "submittedHow": "web",
  "submitter": "SVOM_group <svomgroup@bao.ac.cn>",
  "format": "text/plain",
  "eventId": "EP250302a"
}