{
  "format": "text/plain",
  "body": "Q. J. Huang (PMO, CAS), K. R. Ni (CCNU), T. Wu (AHNU), H. W. Pan (NAO, CAS)  on behalf of the Einstein Probe (EP) team:\n\nEP-FXT performed a follow-up observation of GRB 260917B, detected by SVOM/ECLAIRs (sb26091701; He et al., GCN 45606), which was also observed in optical by SVOM/COLIBRÍ (Dornic et al., GCN 45607), SVOM/VT (Ma et al., GCN 45610), LCO ( Yin et al., GCN 45608), WINTER (Mohan et al., GCN 45611) and FRAM-Auger (Jelinek et al., GCN 45617). The observation started at 2026-09-17 07:43:08 (UTC), about 3.85 hours after the SVOM/ECLAIRs trigger, with an exposure time of 2985 s.\n\nOn-ground analysis of the EP-FXT data found six uncataloged X-ray sources within the SVOM/ECLAIRs error region (He et al., GCN 45606). The position of Source 6 is consistent with that of the optical counterpart candidate (Dornic et al., GCN 45607), and its X-ray flux shows a declining trend. The preliminary results for the X-ray sources are as follows:\n\nSource 1: EPF_J030731.7+252560\nR.A., Decl. (J2000) = 46.8822, 25.4332 deg\nLocalization error radius = 10 arcsec\n0.5-10 keV flux = 7.56e-14 erg/cm^ 2/s\nFlux error = 2.67e-14 erg/cm^2/s (1 sigma)\nSeparation = 3.17 arcmin\n\nSource 2: EPF_J030721.6+252434\nR.A., Decl. (J2000) = 46.8399, 25.4095 deg\nLocalization error radius = 10 arcsec\n0.5-10 keV flux = 5.91e-14 erg/cm^ 2/s\nFlux error = 2.39e-14 erg/cm^2/s (1 sigma)\nSeparation = 4.64 arcmin\n\nSource 3: EPF_J030705.6+252807\nR.A., Decl. (J2000) = 46.7734, 25.4687 deg\nLocalization error radius = 10 arcsec\n0.5-10 keV flux = 5.03e-14 erg/cm^ 2/s\nFlux error = 1.58e-14 erg/cm^2/s (1 sigma)\nSeparation = 5.02 arcmin\n\nSource 4: EPF_J030738.5+252413\nR.A., Decl. (J2000) = 46.9105, 25.4035 deg\nLocalization error radius = 10 arcsec\n0.5-10 keV flux = 1.97e-13 erg/cm^ 2/s\nFlux error = 4.29e-14 erg/cm^2/s (1 sigma)\nSeparation = 5.41 arcmin\n\nSource 5: EPF_J030758.4+253204\nR.A., Decl. (J2000) = 46.9934, 25.5343 deg\nLocalization error radius = 10 arcsec\n0.5-10 keV flux = 8.03e-14 erg/cm^ 2/s\nFlux error =  2.21e-14erg/cm^2/s (1 sigma)\nSeparation = 7.61 arcmin\n\nSource 6: EPF_J030755.8+253327\nR.A., Decl. (J2000) = 46.9823, 25.5576 deg\nLocalization error radius = 10 arcsec\n0.5-10 keV flux = 6.96e-13 erg/cm^ 2/s\nFlux error = 1.83e-13 erg/cm^2/s (1 sigma)\nSeparation = 7.77 arcmin\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).",
  "circularId": 45625,
  "createdOn": 1789726825785,
  "eventType": [
    "GRB",
    "X-ray Transient"
  ],
  "subject": "GRB 260917B: EP-FXT follow-up observation",
  "submittedHow": "web",
  "eventId": "GRB 260917B",
  "submitter": "EP Team at NAOC/CAS <ep_ta@bao.ac.cn>"
}