{
  "body": "S. Antier (OCA), Alan M. Watson (UNAM), Stéphane Basa (UAR Pytheas),\nWilliam H. Lee (UNAM), D. Akl (AUS), Jean-Luc Atteia (IRAP), Nathaniel R.\nButler (ASU), Damien Dornic (CPPM), J.-G. Ducoin (CPPM), Francis Fortin\n(IRAP), Simona Lombardo (LAM), Francesco Magnani (CPPM), and Margarita\nPereyra (UNAM) report:\n\nWe imaged again the field of GRB 241030A detected by Fermi/GBM, Swift/BAT,\nand Swift/XRT (Fermi GBM Team, GCN Circ. 37955; Klingler et al., GCN Circ.\n37956) 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 1200 seconds of exposure from 2024-10-31 01:46:50 to 02:10:56 UTC (0.83\nto 0.85 days after the trigger), we detect the optical counterpart with an\nAB magnitude of:\n\nr = 19.95 +/- 0.06\n\nThis magnitude is consistent with the last optical observations reported\n(GCN Circ. 37993, 37976, 37966 ).\n\nFurther observations are planned.\n\nWe warmly thank the COLIBRI 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>",
  "eventId": "GRB 241030A",
  "createdOn": 1730363774719,
  "bibcode": "2024GCN.38000....1A",
  "submittedHow": "email-legacy",
  "circularId": 38000,
  "subject": "GRB 241030A: COLIBRI Continuing Detection of the Afterglow"
}