{
  "body": "E. Pavoni and L. Moretti (Leavitt Observatory), in 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)\nreport: \n\nWe imaged the field of GRB 230723B detected by SWIFT(trigger 1180410)\nwith telescope of Leavitt Observatory, Italy. Member of: \nUAI/SSV - Unione Astrofili Italiani/sezione stelle variabili.\nATA - Associazione Tuscolana di Astronomia.\n\nThe observations began at 21:31 UT on 2023/07/23, 577 min after the GRB trigger, with our RC telescope D=250 mm F/D=8.\n\nWeather conditions were medium.\n\nWe took 30 images of 120 sec each. All images are unfiltered, calibrated with master dark and master flat, stacked with ASTAP software.\n\nWe have not detected any clearly visible sources, up to 19.9th magnitude with clear sky at \nRA(J2000)  = 16h 41m 43.83s\nDec(J2000) = -05d 17' 16.04\"\n\non a field of view 31.1 x 26.8 arcmin\n\nStart                End              Rlim\n577 min         637 min      19.9\n\nMagnitudes were estimated with the Gaia DR3 cat. and are not corrected for galactic dust extinction.\n\nThe message may be cited.",
  "circularId": 34254,
  "subject": "GRB 230723B: Leavitt Observatory upper limit",
  "createdOn": 1690230725667,
  "eventId": "GRB 230723B",
  "bibcode": "2023GCN.34254....1P",
  "submitter": "leavittob@gmail.com"
}