{
  "bibcode": "2024GCN.37900....1W",
  "subject": "GRB 241026A: COLIBRÍ Detection of the Optical Counterpart",
  "submittedHow": "email-legacy",
  "eventId": "GRB 241026A",
  "submitter": "Alan Watson at UNAM <alan@astro.unam.mx>",
  "createdOn": 1729998756752,
  "body": "Alan M. Watson (UNAM), Stéphane Basa (UAR Pytheas), William H. Lee (UNAM),\nS. Antier (OCA), Jean-Luc Atteia (IRAP), Nathaniel R. Butler (ASU), Damien\nDornic (CPPM), J.-G. Ducoin (CPPM), Francis Fortin (IRAP), Simona Lombardo\n(LAM), Francesco Magnani (CPPM), and Margarita Pereyra (UNAM) report:\n\nWe imaged the field of GRB 241026A detected by Fermi/GBM, Swift/BAT, and\nSwift/XRT (Fermi GBM Team, GCN Circ. 37894; Melandri et al., GCN Circ.\n37896) 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. We observed from 2024-10-27 01:47 to 02:07 UTC (3.1 to\n3.4 hours after the trigger) and obtained 960 seconds of exposure. The data\nwere reduced using custom software and then analyzed and calibrated against\nthe PS1 catalog using the STDWeb service (Karpov et al., 2022).\n\nWe detect the optical counterpart at RA =293.40029 and Dec = 57.98585\n(J2000) with an AB magnitude of:\n\n    r = 19.63 +/- 0.04\n\nThis magnitude is similar to that reported by Moskvitin (GCN Circ. 37899)\nat about 28 minutes after the trigger.\n\nFurther observations are planned.\n\nWe warmly thank the COLIBRÍ engineering team and the staff of the\nObservatorio Astronómico Nacional on the Sierra de San Pedro Mártir.\n",
  "circularId": 37900
}