{
  "circularId": 44086,
  "editedBy": "Judith Racusin at NASA/GSFC <judith.racusin@nasa.gov> on behalf of EP Team at NAOC/CAS <ep_ta@bao.ac.cn>",
  "subject": "GRB 260321A: EP-FXT follow-up observation",
  "bibcode": "2026GCN.44086....1Z",
  "editedOn": 1774279199293,
  "submittedHow": "web",
  "eventId": "GRB 260321A",
  "version": 2,
  "submitter": "EP Team at NAOC/CAS <ep_ta@bao.ac.cn>",
  "format": "text/plain",
  "createdOn": 1774237876547,
  "body": "Z.-C. Zou, Y. H. Jiang (NJU), J. P. Chen (SYSY), Y. J. Yi (BNU), W. D. Zhang (NAOC, CAS) on behalf of the Einstein Probe (EP) team:\n\nEP-FXT performed a follow-up observation of the SVOM/ECLAIRs-detected burst GRB 260321A (SVOM/sb26032123; Brunet et al., GCN 44071) starting at 2026-03-22T15:23:32 UTC, approximately 21 hours after the SVOM trigger, with a total exposure time of 4565 s. Four 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_J143847.8+314542\nRA (J2000): 219.6990\nDec (J2000): 31.7616\nFlux: 9.265 x 10^-14 erg/s/cm2 (observed, 0.5-10 keV)\nFlux_err: 3.498 x 10^-14 erg/s/cm2 (1 sigma)\n\nEPF_J143759.7+314425\nRA (J2000): 219.4989\nDec (J2000): 31.7404\nFlux: 2.9252 x 10^-14 erg/s/cm2 (observed, 0.5-10 keV)\nFlux_err: 1.2651 x 10^-14 erg/s/cm2 (1 sigma)\n\nEPF_J143833.9+314628\nRA (J2000): 219.6440\nDec (J2000): 31.7719\nFlux: 5.9349 x 10^-14 erg/s/cm2 (observed, 0.5-10 keV)\nFlux_err: 2.0193 x 10^-14 erg/s/cm2 (1 sigma)\n\nEPF_J143845.7+313613\nRA (J2000): 219.6902\nDec (J2000): 31.6037\nFlux: 8.0698 x 10^-14 erg/s/cm2 (observed, 0.5-10 keV)\nFlux_err: 1.9625 x 10^-14 erg/s/cm2 (1 sigma)\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)."
}