{
  "body": "A. Brosio (ABObservatory Rosarno), M. A. Tripodi (ABObservatory Rosarno), S. Savaglio (University of Calabria), G. Bracco,  P. Cianfarra, L. Sangaletti, S. Tosi & S. Zappatore (University of Genoa), S. Benatti & M. G. Guarcello (INAF Palermo), L.Cabona, M. Rainer, F. M. Zerbi, M. Basilicata (INAF Brera), D. Ricci (INAF Padova), A. Di Dato (INAF Capodimonte), S. Masiero & A. Nastasi (GAL Hassin), D. Liguori (Osservatorio \"G. Galilei\" Cariati), L. Betti (Osservatorio Polifunzionale del Chianti), R. Nesci (Associazione Astronomica Antares APS di Foligno), for the NOCTIS team report\n\nWe observed the field of GRB 251013C, which was detected by Fermi GBM team (GCN 42221) with the 30-cm automated telescope at ABObservatory (Rosarno, Italy) in V filter. \nThe observations began on 2025 october 13 at 20:56:53 UT, approximately 2.38 hours after the trigger. The observation consisted of 50 exposures of 120 seconds each,with good sky conditions.\nThe mid-exposure time was 22:12:46 UT, and the final exposure ended at 23:32:52 UT.\n\nFrom photometry, we detect the optical counterpart in our images at the following coordinates:\nR.A (J2000.0)  =  23 03 19.712\nDec. (J2000.0) = -00 12 53.17\n\nFrom the full photometric sequence, we obtained a mean magnitude of V = 17.244 +/- 0.213 at mean JD 2460962.42529 with SNR 14.98 (AB, calibrated with the GAIA DR3 on SIMBAD).\n\nWe also performed time-series photometry and obtained a light curve of the optical counterpart during our observing run and the source shows a fading trend, reaching V = 17.848 ± 0.509 at JD 2460962.47774.",
  "submittedHow": "web",
  "version": 3,
  "circularId": 42251,
  "editedOn": 1777658112927,
  "editedBy": "Vidushi Sharma at NASA GSFC/UMBC <vidushi.sharma@nasa.gov> on behalf of A. Brosio at ABObservatory Rosarno <antonino.brosio@gmail.com>",
  "format": "text/plain",
  "submitter": "A. Brosio at ABObservatory Rosarno <antonino.brosio@gmail.com>",
  "eventId": "GRB 251013C",
  "bibcode": "2025GCN.42251....1B",
  "subject": "GRB 251013C: ABObservatory optical observations",
  "createdOn": 1760439236444
}