{
  "submitter": "EP Team at NAOC/CAS <ep_ta@bao.ac.cn>",
  "format": "text/plain",
  "body": "K.R. Ni (CCNU), S. Q. Zheng, Jin-Rui Liu (BNU), Tian-Yu Liu, G. J. Yang, B. B. Zhang and Z.-X. Ling (NAO, CAS), on behalf of the Einstein Probe (EP) team:\n\nWe report on the detection of an X-ray transient by the Wide-field X-ray Telescope (WXT) on board the Einstein Probe (EP) mission, designated EP260920b. The transient triggered EP-WXT (ID: 01709318522) at 2026-09-20T14:07:19 (UTC). The WXT position of the source is R.A. = 325.575 deg, DEC = -28.046 deg (J2000) with an uncertainty of 3 arcmin in radius (90% C.L. statistical and systematic).\n\nAs the autonomous FXT follow-up was not triggered, a follow-up observation with the Follow-up X-ray Telescope (FXT) was subsequently performed. Within the WXT error circle, an uncatalogued X-ray source was detected at R.A. = 325.5844 deg, DEC = -28.0406 deg (J2000) with an uncertainty of 20 arcsec in radius (90% C.L. statistical and systematic).\n\nFurther information will be updated when the telemetry data is received.\n\nLaunched on January 9, 2024, EP is a space X-ray observatory to monitor the soft X-ray sky with X-ray follow-up capability (Yuan et al. 2022, Handbook of X-ray and Gamma-ray Astrophysics).",
  "subject": "EP260920b: Einstein Probe detection of an X-ray transient",
  "eventType": [
    "X-ray Transient"
  ],
  "eventId": "EP260920b",
  "circularId": 45664,
  "createdOn": 1789951330022,
  "submittedHow": "web"
}