{
  "circularId": 45445,
  "submitter": "SVOM_group <svomgroup@bao.ac.cn>",
  "subject": "GRB 260807A: EP-FXT follow-up observations",
  "eventType": [
    "GRB",
    "X-ray Transient"
  ],
  "submittedHow": "web",
  "createdOn": 1787742687663,
  "body": "Ruizhi Li (YNAO), Chao Wu, Huali Li, Wenjin Xie, Donghua Zhao (NAOC), Hui Yang, Laurent Bouchet (IRAP) report:\n\nWe performed two EP/FXT observations of the possible faint GRB 260807A detected by SVOM/ECLAIRs (Xie et al., GCN 45308). The first EP/FXT observation started at 2026-08-07 12:51:33 UTC, approximately 1.85 hours post-trigger, with an exposure time of 5.8 ks. The second EP/FXT observation started at 2026-08-13 07:44:00 UTC, approximately 5.86 days post-trigger, with an exposure time of 4.3 ks.\n\nWe analyzed the data from the two EP/FXT observations. None of the X-ray sources within the SVOM/ECLAIRs error circle (Xie et al., GCN 45308) showed significant fading between the two EP/FXT observations, with 90% confidence upper limits on the flux of 2.85 x 10^-14 erg cm^-2 s^-1 and 3.67 x 10^-14 erg cm^-2 s^-1, respectively.\n\nWe conclude that no credible X-ray source within the SVOM/ECLAIRs error circle can be identified as the X-ray afterglow of the burst.",
  "eventId": "GRB 260807A",
  "format": "text/plain"
}