{
  "body": "Claudio Lopresti (Gruppo Astronomia Digitale - GAD Observatory, La Spezia, 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)\nUnione Astrofili Italiani (UAI)\nreport: \n \nWe imaged the field of GRB 230723B detected by SWIFT(trigger 1180410)\nwith the telescope LX200 12” of GAD Observatory, La Spezia, Italy\nMember of: \n \nUAI/SSV - Unione Astrofili Italiani/sezione stelle variabili, GRB section.\nGAD - Gruppo Astronomia Digitale.\n \nThe observations started 557 min after the GRB trigger, at the end of twilight, \nwith a Shmidt-Cassegrain telescope D=304 mm with reducer F/D=4.75.\n \nWeather conditions were medium.\n \nWe co-added 42 exposures of 120 sec each.\n \n \nStart T0+      End T0+       R lim\n557 min        641 min         19\n \nWe did not found any optical counterpart in the error box of the XRT candidate.\nPage et al. GCN 34234\n \nMagnitudes were estimated with the Gaia EDR3 cat. and \nare not corrected for galactic dust extinction.\n \nReference:\nhttps://www.parcodellestelle.com/\n \nThe message may be cited.\n",
  "subject": "GRB 230723B: GAD Observatory, La Spezia, Italy upper limit",
  "createdOn": 1690318893334,
  "bibcode": "2023GCN.34259....1L",
  "eventId": "GRB 230723B",
  "circularId": 34259,
  "submitter": "Claudio Lopresti <cl3lop@gmail.com>"
}