{
  "subject": "GRB 260822A: SVOM/COLIBRÍ (FM-GFT) possible optical counterpart candidate",
  "submitter": "Stephane Basa at UAR Pytheas/OHP, LAM <stephane.basa@lam.fr>",
  "createdOn": 1787476561617,
  "eventId": "GRB 260822A",
  "submittedHow": "web",
  "body": "Noémie Globus (UNAM), Stéphane Basa (UAR Pytheas), William H. Lee (UNAM), Edilberto Aguilar-Ruiz (UNAM), Jean-Luc Atteia (IRAP), Camila Angulo (UNAM), Dalya Akl (NYUAD), Sarah Antier (IJCLAB), Rosa L. Becerra (UNAM), Nathaniel R. Butler (ASU), Damien Dornic (CPPM), Jean-Grégoire Ducoin (CPPM), Francis Fortin (IRAP),  Leonardo García-García (UNAM), Ramandeep Gill (UNAM), Marion Guelfand (CPPM), Asuka Kuwata (UNAM), Massimiliano Lincetto (CPPM), Nikos Mandarakas (LAM), Diego López-Cámara (UNAM), Francesco Magnani (CPPM), Enrique Moreno Méndez (UNAM), Margarita Pereyra (UNAM), Fredd Sánchez Álvarez (UNAM), Benjamin Schneider (LAM), Antonio de Ugarte Postigo (LAM),  Alan M. Watson (UNAM) and Damien Turpin (CEA/Irfu) report:\n\nWe imaged the field of the SVOM GRB 260822A (Schanne et al., GCN Circ. 45422) using the DDRAGO two-channel wide-field imager on the SVOM/COLIBRÍ (FM-GFT) telescope. We observed from 2026-08-23 04:56 to 08:40 UTC (from 12.1 to 15.8 hours after the trigger) and obtained 82 minutes of simultaneous exposure in the r and z filters.\n\nThe data were reduced and coadded and analysed with the COLIBRÍ and ASU pipelines. The photometry was calibrated using nearby stars from the PanSTARRS DR2 catalog, is in the AB system, and is not corrected for Galactic extinction.\n\nIn the stacked image, we tentatively detected a faint, uncatalogued source in both bands, consistent with the SVOM/ECLAIRs error circle at:\n  RA (J2000) = 00:09:45.57 = 2.43988 deg\n  Dec (J2000) = +01:23:23.2 = 1.38978 deg,\n\nwith an estimated astrometric uncertainty of 0.5 arcsec.\n\nThe preliminary magnitude derived for that source was:\n  r = 22.88 ± 0.09\n  z = 22.08 ± 0.14\n\nWe encourage additional observations to confirm the nature of the source.\n\nWe thank the staff of the Observatorio Astronómico Nacional at Sierra de San Pedro Mártir, as well as the technical and engineering teams at CEA, CPPM, IRAP, LAM, OHP, OSU Pytheas, and UNAM.\n\nCOLIBRÍ is an astronomical observatory developed and operated jointly by France (AMU, CNES and CNRS) and Mexico (UNAM and SECIHTI). It is located at the Observatorio Astronómico Nacional on the Sierra de San Pedro Mártir, Baja California, Mexico.\n",
  "version": 2,
  "circularId": 45429,
  "editedBy": "Judith Racusin at NASA/GSFC <judith.racusin@nasa.gov> on behalf of Stephane Basa at UAR Pytheas/OHP, LAM <stephane.basa@lam.fr>",
  "eventType": [
    "GRB",
    "X-ray Transient",
    "Optical Transient"
  ],
  "format": "text/plain",
  "editedOn": 1787519651153
}