{
  "createdOn": 1734489377895,
  "circularId": 38602,
  "format": "text/plain",
  "bibcode": "2024GCN.38602....1L",
  "body": "R.-Z. Li, B.-T. Wang, F.-F. Song, J. Mao, H.-C. Feng and J.-M. Bai (YNAO, CAS) report:\n\nWe observed the field of GRB 241217A (Marius et al., GCN 38594, T0 at 2024-12-17T16:57:13) using the GMG-2.4m telescope at the Lijiang Observatory. The observation began at 2024-12-17T17:30:55, about 0.56 hours after the trigger.\n\nNo new uncataloged optical source was detected within the SVOM/VT error circle (GCN 38600).\n\nThe preliminary analysis results are shown as follows:\n+----------------+------------+----------+----------------+\n|  Tmid-T0 [hr]  |  Exp. [s]  |  Filter  |  5-sigma U.L.  |\n+================+============+==========+================+\n|      0.65      |    600     |    r     |       20.6     |\n+----------------+------------+----------+----------------+\nThe given magnitudes are derived based on calibrating against Pan-STARRS1 field stars.\n",
  "eventId": "GRB 241217A",
  "subject": "GRB 241217A: GMG Optical Upper Limit",
  "submittedHow": "web",
  "submitter": "Rui-Zhi Li at Yunnan Observatories, CAS <liruizhi@ynao.ac.cn>"
}