{
  "eventId": "EP250321a",
  "subject": "EP250321a: WFST optical observations",
  "submittedHow": "web",
  "body": "Jia-Zheng Zhu, Jin-Jun Geng, Ze-Lin Xu, Ning Jiang, Yan-Long Hua, Yi-Fang Liang, Ding-Fang Hu, Ji-An Jiang, Xue-Feng Wu, and Tian-Rui Sun report on behalf of the WFST team:\n\nFollowing the detection of EP250321a by Einstein Probe (Hu  et al., GCN 39800), we use the Wide Field Survey Telescope (WFST Collaboration; arXiv:2306.07590) at Lenghu Astronomical Observation Base (Qinghai province, China) to search and follow up its afterglow. We observed the target position with 3x120s exposure in r-band starting from 2025-03-21T14:17:14. \n\nWe clearly detect the optical transient (OT) reported by GCNs (Fu et al., GCN 39804; Perez-Garcia et al al., GCN 39805; Brivio et al., GCN 39807; Zhu et al., GCN 39809; Becerra et al., GCN 39810; Pérez-Fournon et al., GCN 39812; Lee et al., GCN 39815; Ghosh et al., GCN 39816; Han et al., GCN 39817; Jin et al., GCN 39822) in our image. Our preliminary results are as follows:\n\n|Date|\t\t|UTstart|\t|t-T0 (hours)|\t|Exp (sec)|\t|Filter|\t|Magnitude| \n----------------------------------------------------------------------------------------------      \n2025-03-21\t14:17:14\t8.12\t\t3 x 120 \tr\t\t22.57 +/- 0.12\n\nWe thank the WFST staff for supporting these observations.\n",
  "format": "text/plain",
  "bibcode": "2025GCN.39827....1Z",
  "circularId": 39827,
  "createdOn": 1742611865020,
  "submitter": "Jin-Jun Geng at PMO <jjgeng@pmo.ac.cn>"
}