{
  "circularId": 45646,
  "eventType": [
    "X-ray Transient"
  ],
  "subject": "EP260917a: refined analysis of the EP-FXT observations",
  "submittedHow": "web",
  "createdOn": 1789832655672,
  "eventId": "EP260917a",
  "submitter": "EP Team at NAOC/CAS <ep_ta@bao.ac.cn>",
  "format": "text/plain",
  "body": "T. Wu (AHNU), Q. J. Huang (PMO, CAS), K. R. Ni (CCNU), H. W. Pan (NAO, CAS) on behalf of the Einstein Probe (EP) team:\n \nWe performed a follow-up observation of EP260917a (Huang et al., GCN 45621). The observation started at 2026-09-18T10:38:31 (UTC, T0+25 hours). The effective exposure time of the observation is around 6 ks. On-ground analysis of the FXT data found a weak uncatalogued source at R.A. = 335.1539, DEC = 9.4534 (J2000) with an uncertainty of 10 arcsec (radius, 90% C.L. statistical and systematic), which is consistent with the WXT position (Huang et al., GCN 45621). The average unabsorbed flux is around 5e-14 erg/s/cm^2 in the 0.5-10 keV energy band.\n\nNo counterparts were detected by COLIBRÍ (Guelfand et al., GCN 45624), WINTER (Mohan et al., GCN 45628), or SVOM/VT (Li et al., GCN 45642). \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).\n\n"
}