{
  "format": "text/plain",
  "circularId": 46077,
  "createdOn": 1793246149551,
  "eventType": [
    "X-ray Transient",
    "Optical Transient"
  ],
  "body": "Junjie-Jin (NAOC), Haiyang-Mu (NAOC), Yue Sun (NAOC), Yu-Zhang (NAOC), Pengliang-Du (NAOC), Zhou-Fan (NAOC), Hong-Wu (NAOC) report on behalf of a large collaboration:\n\nWe observed the field of EP261006a (Lao et al., GCN 45826) with the Beijing-Faint Object Spectrograph and Camera (BFOSC) on the Xinglong 2.16-m telescope on 2026 October 21. We performed image subtraction using archival Pan-STARRS images and measured the optical transient AT 2026aetp at the position reported by TNS (RA = 01:27:10.008, Dec = +12:53:26.88). \n\nOur host-subtracted aperture photometry is:\n\nMid-time (UT)             Filter  Exposure       Magnitude (AB)       5-sigma depth (AB)\n2026-10-21 19:23:19.545  g       3 x 300 s      18.665 +/- 0.031      21.31\n2026-10-21 19:39:05.961  r       3 x 300 s      18.968 +/- 0.061      21.26\n2026-10-21 19:55:07.161  i       3 x 300 s      19.316 +/- 0.103      20.89\n\nThe g-, r-, and i-band filters were used for the respective measurements. All three measurements are detections in the difference images and the magnitudes are calibrated to the Pan-STARRS AB reference system. \n\nEarlier optical observations of this transient were reported by Eyles-Ferris et al. (GCN 45831), Wu et al. (GCN 45852), and Pawar et al. (GCN 45966).",
  "submitter": "Xinglong Observatory at National Astronomical Observatories (NAOC), Chinese Academy of Sciences (CAS) <xinglong@nao.cas.cn>",
  "subject": "EP261006a / AT 2026aetp: Xinglong 2.16-m optical follow-up",
  "submittedHow": "web",
  "eventId": "EP261006a"
}