{
  "circularId": 45668,
  "format": "text/plain",
  "eventId": "EP260920b",
  "submitter": "liuxing@nao.cas.cn",
  "submittedHow": "web",
  "eventType": [
    "X-ray Transient",
    "Optical Transient"
  ],
  "subject": "EP260920b: LCO optical counterpart detection",
  "createdOn": 1789956814881,
  "body": "\nX. Liu, D. Xu, J. An, Z. Fan, J.F. Gou, L.B. He, S.Q. Jiang, W.X. Li, R.D. Liang, Q. Zhao, Z.P. Zhu (NAOC), S.Y. Fu, L. Lei (HUST), Y.L. Hua (PMO) report:\n\nWe observed the field of EP260920b detected by EP (Ni et al., GCN 45664), using an LCO 1m telescope network. We obtained 3*200s exposures in the SDSS r' filter.\n\nAn uncatalogued and decaying source is detected within the EP-FXT error circle (Ni et al., GCN 45664) at coordinates\n\nR.A. (J2000) = 21:42:20.79\nDec. (J2000) = -28:02:24.4\n\nwith an uncertainty of ~ 0.5 arcsec. The source had r = 18.97 +/- 0.04 mag at a median time of 0.68 hr post-trigger, calibrated with Pan-STARRS DR2 and not corrected for Galactic extinction.\n\nWe thus think the source is the optical counterpart of EP260920b."
}