{
  "circularId": 37292,
  "body": "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)\n\nSVOM JSWG: Jian-Yan Wei (NAOC,  China), Bertrand Cordier (CEA, F), Shuang-Nan Zhang (IHEP, CN), Stephane  Basa (LAM, F), Jean-Luc Attéia (IRAP, F), Arnaud Claret (CEA, F),  Zi-Gao Dai (USTC, CN), Frederic Daigne (IAP, F), Jin-Song Deng (NAOC,  CN), Andrea Goldwurm (APC, F), Diego  Götz (CEA, F), Xu-Hui Han (NAOC, CN), Cyril Lachaud (APC, F), En-Wei Liang (GXU, CN), Yu-Lei Qiu (NAOC,  CN), Susanna Vergani (Obs.Paris, F), Jing Wang (NAOC, CN), Chao Wu(NAOC, CN), Li-Ping Xin (NAOC,CN), Bing Zhang (UNLV, CN)\n\n\nWe observed the burst GRB 240825A (Swift trigger 1250617, Gupta et al., GCN 37274; Fermi/GBM trigger 746293985.085054 / 240825662, GCN 37273) on 15:54:05 UT, Aug. 25, 2024, about 65 seconds after the Swift trigger with C-GFT (Chinese Ground Follow-up Telescope in SVOM mission) in System Test Mode (STM). 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. \n\n\nA series of g,r and i band images were obtained. The exposure time was 10 seconds for each frame. The optical optical afterglow reported (Jiang et al., GCN 37275; Dutton et al., GCN 37276; Odeh et al., GCN 37277; Zhang et al., GCN 37278; Li et al., GCN 37280; Izzo et al., GCN 37287, Lipunov GCN 37289, Leonini GCN 37291) are clearly detected in our images. \nThe preliminary photometric results are listed as following, \n-----------------------------------------------------------\n Filter    (t-T0) sec          mag  +/- mag_error \n  g       65  -> 2555     14.56 +/- 0.02 -> 19.18 +/- 0.20 \n  r       206 -> 2088     14.56 +/- 0.02 -> 19.33 +/- 0.15 \n  i       294 -> 2162     16.79 +/- 0.02 -> 19.33 +/- 0.15\n\n\nThe photometry was calibrated with nearby PS1 catalogs. More detailed analysis is continuing.\n \nWe thank the observation assistant Chunlei Guo at Jilin observatory for their excellent support.\n\nThe SVOM/C-GFT point of contact for this burst is: Chao Wu (cwu@bao.ac.cn)",
  "submittedHow": "web",
  "editedBy": "Vidushi Sharma at NASA GSFC/UMBC <vidushi.sharma@nasa.gov> on behalf of Chao Wu at NAOC <wuchao.lamost@gmail.com>",
  "format": "text/plain",
  "subject": "GRB 240825A: SVOM/C-GFT optical observations",
  "submitter": "Chao Wu at NAOC <wuchao.lamost@gmail.com>",
  "editedOn": 1724679705453,
  "eventId": "GRB 240825A",
  "bibcode": "2024GCN.37292....1S",
  "createdOn": 1724643303399,
  "version": 2
}