{
  "subject": "EP240918a: GMG Optical Upper Limit",
  "submittedHow": "web",
  "bibcode": "2024GCN.37544....1W",
  "circularId": 37544,
  "body": "B.-T. Wang, R.-Z. Li, F.-F. Song, J. Mao, Y.-F. Fan and J.-M. Bai (YNAO, CAS) report:\n\nWe observed the field of EP240918a (Zhang et al., GCN 37541, T0 at 2024-09-18T11:24:37) using the GMG-2.4m telescope at the Lijiang Observatory. The observation began at 2024-09-18T14:02:51, about 2.64 hours after the trigger.\n\nNo new credible optical counterpart of EP240918a was detected within the EP-FXT error circle (GCN 37541).\n\nThe preliminary analysis results are shown as follows:\n+----------------+------------+----------+----------------+\n|  Tmid-T0 [hr]  |  Exp. [s]  |  Filter  |  5-sigma U.L.  |\n+================+============+==========+================+\n|      2.72      |    600     |    R     |      20.5      |\n+----------------+------------+----------+----------------+\nThe given magnitudes are derived based on calibrating against Pan-STARRS1 field stars.\n\nWe acknowledge the staff at the Lijiang Observatory for conducting the observation.\n",
  "format": "text/plain",
  "submitter": "wangbaiting@ynao.ac.cn",
  "createdOn": 1726674275643,
  "eventId": "EP240918a"
}