{
  "bibcode": "2025GCN.40941....1L",
  "subject": "EP250704a: Einstein Probe detection of an X-ray transient",
  "body": "A. Li (BNU), Y.H Cheng (SWIFAR,YNU), C. Zhou (HUST), G.Y. Zhao (SYSU), Y. J. Zhang (THU) and W. D. Zhang (NAOC) 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 EP250704a. The transient triggered EP-WXT (ID: 01709181144) at 2025-07-04T08:16:52 (UTC). The WXT position of the source is R.A. = 300.872 deg, DEC = 12.030 deg (J2000) with an uncertainty of 3 arcmin in radius (90% C.L. statistical and systematic).\n\nA follow-up observation with the Follow-up X-ray Telescope (FXT) was performed automatically. Within the WXT error circle, an uncatalogued X-ray source was detected at R.A. = 300.8742, DEC = 12.0243 deg (J2000) with an uncertainty of 20 arcsec in radius (90% C.L. statistical and systematic).\n\nThis transient is temporally coincidence with GRB 250704B (GCN 40940). Further 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).",
  "submittedHow": "web",
  "submitter": "EP Team at NAOC/CAS <ep_ta@bao.ac.cn>",
  "eventId": "EP250704a",
  "format": "text/markdown",
  "createdOn": 1751622647923,
  "circularId": 40941
}