{
  "submitter": "Xinglong Observatory at National Astronomical Observatories (NAOC), Chinese Academy of Sciences (CAS) <xinglong@nao.cas.cn>",
  "circularId": 43496,
  "eventId": "EP260119a",
  "subject": " EP260119a: Xinglong optical upper limit",
  "createdOn": 1769052592667,
  "version": 2,
  "editedOn": 1769099433317,
  "submittedHow": "web",
  "bibcode": "2026GCN.43496....1J",
  "editedBy": "Judith Racusin at NASA/GSFC <judith.racusin@nasa.gov> on behalf of Xinglong Observatory at National Astronomical Observatories (NAOC), Chinese Academy of Sciences (CAS) <xinglong@nao.cas.cn>",
  "format": "text/plain",
  "body": "Junjie-Jin (NAOC), Haiyang-Mu (NAOC), Sen-Liu (NAOC), Pengliang-Du (NAOC),\nZhou-Fan (NAOC), Hong-Wu (NAOC) report:\nFollowing the detection of EP260119a by EP-WXT (GCN Circular 43447,GCN Circular 43452), we observed the field of EP260119a using the 2.16-m\ntelescope at Xinglong Observatory, NAOC. We obtained 600s clear-band frames with a\nmedian time of 2026-01-19 18:38:00 hr after the EP trigger.\nNo uncatalogued optical transient is detected in the stacked images within the 3 arcmin\nEP/WXT error circle (GCN Circular 43447), down to 5-sigma limiting magnitudes of z ~\n19.8(not good day with thin cloud and bad seeing), calibrated with Pan-STARRS sources in the field. Also there is no apparent brightening for the catalogued sources within the error circle. Based on the location of the report(GCN Circular 43452), the target was not observed."
}