{
  "format": "text/plain",
  "subject": "GRB 260310A / AT2026fgk: ABObservatory and NOCTIS optical observations",
  "body": "A. Brosio (ABObservatory Rosarno), M. A. Tripodi (ABObservatory Rosarno), S. Savaglio (Università della Calabria), S. Benatti, M. G. Guarcello (INAF - Osservatorio Astronomico di Palermo), M. Basilicata, L. Cabona, M. Rainer, F. M. Zerbi (INAF - Osservatorio Astronomico di Brera), G. Bracco, P. Cianfarra, L. Sangaletti, S. Tosi, S. Zappatore (Università di Genova), A. Di Dato (INAF - Osservatorio Astronomico di Capodimonte), D. Liguori (Osservatorio \"G. Galilei\", Liceo Scientifico Cariati), S. Masiero, A. Nastasi (GAL Hassin, Isnello), R. Nesci (Associazione Astronomica Antares APS di Foligno), L. Betti, E. Pace, R. Stanga (Università di Firenze), D. Ricci (INAF - Osservatorio Astronomico di Padova) for the NOCTIS team report\n\nWe observed the transient AT 2026fgk, proposed as the likely optical counterpart of GRB 260310A (Konno et al., GCN 43974; Hamburg & Meegan,GCN 43975).\n\nObservations were carried out on 2026-03-14.80913 UT with the 0.30-m f/4 telescope at ABObservatory in clear band\n\nThe obtained photometry is:\n\n2026-03-14.80913 UT   JD 2461114.30913   m_CV = 18.50 +/- 0.04 mag\n\nThe measurement was calibrated against two APASS catalog stars,selected using Aladin. The reported magnitude is in the CV system.\n\nThis measurement confirms that the optical counterpart is still clearly detected about 4.6 days after the GRB trigger.",
  "circularId": 44021,
  "createdOn": 1773591178109,
  "submitter": "A. Brosio at ABObservatory Rosarno <antonino.brosio@gmail.com>",
  "bibcode": "2026GCN.44021....1B",
  "submittedHow": "web",
  "eventId": "GRB 260310A"
}