{
  "circularId": 45650,
  "eventType": [
    "X-ray Transient",
    "Optical Transient"
  ],
  "eventId": "EP260920a",
  "body": "\nX. Liu, D. Xu, J. An, Z. Fan, J.F. Gou, L.B. He, Y.L. Hua, S.Q. Jiang, W.X. Li, R.D. Liang, Q. Zhao, Z.P. Zhu (NAOC), Y.L. Hua (PMO), S.Y. Fu, L. Lei (HUST) report:\n\nWe observed the field of EP260920a triggered by Einstein Probe (EP; Ni et al., GCN 45649), using an LCO 1m telescope network. We obtained 3 x 200 s exposures in the w filter.\n\nA residual optical transient (OT) is detected at coordinates\n\nR.A. (J2000) = 01:46:06.71\nDec. (J2000) = -13:59:06.1 \n\nafter subtracting the archival Legacy Survey image, which is within the EP-FXT error circle (EP; Ni et al., GCN 45649). There is a known source at the above coordinates, which has g = 23.39, r = 22.02, i = 20.68, and z = 20.14, and is classified as Point-like in Legacy Survey. The OT and the known source together has r ~ 21.67 mag in the LCO stacked image at a median time of ~1.174 hr post-trigger, and the OT was decaying in the LCO three images.\n\nWe thus think the above OT/known source could be optical counterpart of EP260920a.",
  "submittedHow": "web",
  "submitter": "liuxing@nao.cas.cn",
  "subject": "EP260920a: LCO optical counterpart candidate",
  "createdOn": 1789871620554,
  "format": "text/plain"
}