{
  "circularId": 40709,
  "eventId": "EP250612a",
  "subject": "EP 250612a: AST3-3 Yaoan Optical Observation",
  "submitter": "ylhua@pmo.ac.cn",
  "format": "text/plain",
  "bibcode": "2025GCN.40709....1H",
  "submittedHow": "web",
  "body": "Yan-Long Hua, Tian-Rui Sun, Lei Hu, Jin-Jun Geng, Xue-Feng Wu (PMO, CAS), report on behalf the AST3 Team:\n    \nFollowing the detection of EP 250612a detected by Einstein Probe (Hua et al., GCN 40700), and its potential gamma-ray counterpart by Fermi (Fermi GBM team, GCN 40702), we use Antarctic Survey Telescope 3-3 at Yaoan Astronomy Observation (China, Yunnan) to follow up for the afterglow.\n\nWe observed the target position with 30 x 180s exposure in g-band starting from  2025-06-12T13:12:59.95 about 0.75 hours after the burst.\n\nNo new optical source was detected within the error box (Hua et al., GCN 40700) down to 20.27 mag in the coadd image (total 30x180s, g-band).",
  "createdOn": 1749746968951
}