{
  "createdOn": 1730813867896,
  "submittedHow": "email",
  "body": "Alan M. Watson (UNAM), Francis Fortin (IRAP), Stéphane Basa (UAR Pytheas),\nWilliam H. Lee (UNAM), S. Antier (OCA), D. Akl (AUS), Jean-Luc Atteia\n(IRAP), Nathaniel R. Butler (ASU), Damien Dornic (CPPM), J.-G. Ducoin\n(CPPM), Simona Lombardo (LAM), Francesco Magnani (CPPM), and Margarita\nPereyra (UNAM)\n\nSVOM JSWG: Jian-Yan Wei (NAOC), Bertrand Cordier (CEA), Shuang-Nan Zhang\n(IHEP), Stéphane Basa (LAM), Jean-Luc Atteia (IRAP), Arnaud Claret (CEA),\nZi-Gao Dai (USTC), Frédéric Daigne (IAP), Jin-Song Deng (NAOC), Andrea\nGoldwurm (APC), Diego Götz (CEA), Xu-Hui Han (NAOC), Cyril Lachaud (APC),\nEn-Wei Liang (GXU), Yu-Lei Qiu (NAOC), Susanna Vergani (Obs.Paris), Jing\nWang (NAOC), Chao Wu (NAOC), Li-Ping Xin (NAOC), Bing Zhang (UNLV)\n\nreport:\n\nWe imaged the field of GRB 241104A detected by Fermi/GBM, SVOM/GRM,\nSVOM/ECLAIRs, and EP/WXT (Fermi GBM Team, GCN Circ. 38075; Schanne et al.,\nGCN Circ. 38078; SVOM/GRM Team, GCN Circ. 38082; Zhou et al., GCN Circ.\n38081) during the commissioning of the COLIBRÍ (SVOM/F-GFT) telescope at\nthe Observatorio Astronómico Nacional on the Sierra de San Pedro Mártir in\nMexico.\n\nWe observed with the engineering test camera in a red filter that\napproximates SDSS r. The data were reduced using custom software and then\nanalysed and calibrated against the PS1 catalog using the STDWeb service\n(Karpov et al. 2022).\n\nIn 960 seconds of exposure from 2024-11-05 12:12 to 12:32 UTC (17.70 to\n18.03 hours after the trigger), at high airmass, we detect no sources in\nthe ECLAIRs localization region other than those previously identified in\nthe PS1 or GAIA DR3 catalogs to a 5-sigma limiting AB magnitude of:\n\nr > 20.8\n\nWe warmly thank the COLIBRÍ engineering team and the staff of the\nObservatorio Astronómico Nacional on the Sierra de San Pedro Mártir.\n",
  "submitter": "Alan Watson at UNAM <alan@astro.unam.mx>",
  "bibcode": "2024GCN.38083....1W",
  "circularId": 38083,
  "eventId": "GRB 241104A",
  "subject": "GRB 241104A: COLIBRÍ Upper Limits on the Optical Counterpart"
}