{
  "bibcode": "2025GCN.38748....1S",
  "body": "M. Serino, S. Sugita, Y. Kawakubo, H. Hiramatsu, H. Nishikawa, Y. Kondo (AGU),\nH. Negoro, M. Nakajima, K. Takagi (Nihon U.),\nN. Kawai, T. Mihara, (RIKEN)\nreport on behalf of the MAXI team:\n\nWe examined MAXI/GSC all-sky X-ray images (2-20 keV)\nafter compact binary merger candidate S241231du at 2024-12-31 13:16:46.194 UTC.\n\nAt the trigger time of S241231du, the high-voltage of MAXI/GSC was on.\nThe instantaneous field of view of GSC at the GW trigger time covered 4% of the 90% credible region\nof the bayestar sky map, in which we found no significant new X-ray source.\nThe first one-orbit (92 min) scan observation with GSC after the event covered 90%\nof the 90% credible region of the bayestar skymap from 13:16:46 to 14:48:44 UTC (T0+0 to T0+5518 sec).\n\nNo significant new source was found in the region in the one-orbit scan observation.\nA typical 1-sigma averaged upper limit obtained in one scan observation\nis 20 mCrab at 2-20 keV.\n\nIf you require information about X-ray flux by MAXI/GSC at specific coordinates,\nplease contact the submitter of this circular by email. \n",
  "eventId": "LIGO/Virgo/KAGRA S241231du",
  "createdOn": 1735698575574,
  "submittedHow": "web",
  "format": "text/plain",
  "circularId": 38748,
  "subject": "LIGO/Virgo/KAGRA S241231du: Coverage and upper limit from MAXI/GSC observations",
  "submitter": "Motoko Serino at Aoyama Gakuin U. <serino@phys.aoyama.ac.jp>"
}