{
  "body": "TITOLO: Swift J1727.8-1613 (GRB 230824A): Madrona Peak Observatory - optical follow-up\n\nNello Ruocco at Osservatorio Nastro Verde - Sorrento (Naples) - Italy\nin a large collaboration with:\nM.G. Dainotti (National Astronomical Observatory of Japan), \nY. Niino (Tokyo University, Institute of Astronomy), \nK. Kalinowski (Aarhus University, Department of Physics and Astronomy),\nB. De Simone (Universita' degli Studi Di Salerno)\nAAVSO - American Association of Variable Star Observers.\nUAI/SSV - Unione Astrofili Italiani/sezione stelle variabili.\nAstroCampania Associazione.\nreport:\n\nFollowing the Swift trigger no. 1186959 (GCN 34537), using the 24 Inch RC Optical Ritchey-Chretien Reflector telescope and the Apogee Aspen CG16M camera of the Madrona Peak Observatory connected to the AAVSONet network,\nwe obtained a series of B,V,R images of the transient approximately 6 months after the first detection. \nThe images were measured with the VPhot AAVSO software, using the APASS catalogue. The photometry obtained on 19/23/25 February 2024 are as follows:\n\nwith the following photometry:\n\n    JD\t           Mag\t        Filter\n2460363.97895\t15.830            V\n2460363.97781\t15.987            V\n2460359.99249\t15.864            V\n2460359.99139\t15.837            V\n\n\t\n\n\nJD\t          Mag\t       Filter\n2460365.97083\t15.713            R\n2460363.98126\t15.552            R\n2460363.98014\t15.535            R\n2460359.99473\t15.530            R\n2460359.99362\t15.512            R\n\n\n\nJD\t          Mag\t       Filter\n2460363.97611\t15.230            B\n2460363.97427\t16.275            B\n2460359.98979\t16.096            B\n2460359.98799\t16.131            B\n\n\n\n\nThe magnitudes are calibrated with stars of the APASS catalog are not corrected for the expected Galactic extinction.\n\nThe message may be cited.",
  "submittedHow": "web",
  "circularId": 35823,
  "bibcode": "2024GCN.35823....1R",
  "createdOn": 1709060893595,
  "eventId": "GRB 230824A",
  "subject": "Swift J1727.8-1613 (GRB 230824A): Madrona Peak Observatory - optical follow-up",
  "submitter": "Nello Ruocco at Osservatorio Nastro Verde - Sorrento (Naples) - Italy - MPC Code C82 <osservatorionastroverde@gmail.com>"
}