{
  "submitter": "EP Team at NAOC/CAS <ep_ta@bao.ac.cn>",
  "format": "text/plain",
  "body": "Y.H.Cheng, D.Zhu, K.J.Zhang (SWIFAR, YNU), H.C.Ding, T.Wu (AHNU), C.C.Jin (NAOC) on behalf of the Einstein Probe (EP) team:\n\nEP-FXT performed a follow-up observation of the SVOM/ECLAIRs-detected burst GRB 260228A (SVOM/sb26022802; Julakanti et al., GCN 43882) starting at 2026-02-28T22:50:15 UTC, approximately 5 minutes after the SVOM trigger, with a total exposure time of 5527 s. Six uncataloged sources are detected within the ECLAIRs error circle. Preliminary analysis on these sources is automatically conducted, and the details are listed as follows. \n\nEPF_J155124.0+262035\nRA (J2000): 237.8501\nDec (J2000): 26.3431\nFlux: 2.1373 x 10^-12 erg/s/cm2 (observed, 0.5-10 keV)\nFlux_err: 1.6673 x 10^-13 erg/s/cm2 (1 sigma)\n\nEPF_J155105.1+261820\nRA (J2000): 237.7711\nDec (J2000): 26.3055\nFlux: 9.6351 x 10^-14 erg/s/cm2 (observed, 0.5-10 keV)\nFlux_err: 1.891 x 10^-14 erg/s/cm2 (1 sigma)\n\nEPF_J155123.9+261238\nRA (J2000): 237.8498\nDec (J2000): 26.2105\nFlux: 7.077 x 10^-14 erg/s/cm2 (observed, 0.5-10 keV)\nFlux_err: 1.6973 x 10^-14 erg/s/cm2 (1 sigma)\n\nEPF_J155130.8+261248\nRA (J2000): 237.8781\nDec (J2000): 26.2134\nFlux: 1.231 x 10^-13 erg/s/cm2 (observed, 0.5-10 keV)\nFlux_err: 2.1478 x 10^-14 erg/s/cm2 (1 sigma)\n\n\nEPF_J155140.7+261349\nRA (J2000): 237.9195\nDec (J2000): 26.2303\nFlux: 1.5723 x 10^-13 erg/s/cm2 (observed, 0.5-10 keV)\nFlux_err: 3.1532 x 10^-14 erg/s/cm2 (1 sigma)\n\nEPF_J155148.8+262150\nRA (J2000): 237.9533\nDec (J2000): 26.3640\nFlux: 1.0194 x 10^-13 erg/s/cm2 (observed, 0.5-10 keV)\nFlux_err: 2.9166 x 10^-14 erg/s/cm2 (1 sigma)\n\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": 43900,
  "submittedHow": "web",
  "bibcode": "2026GCN.43900....1C",
  "createdOn": 1772521227296,
  "eventId": "GRB 260228A",
  "subject": "GRB 260228A: EP-FXT follow-up observation"
}