{
  "createdOn": 1690230044989,
  "bibcode": "2023GCN.34253....1R",
  "circularId": 34253,
  "body": "Nello 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)\nreport: \n\nWe image the field of GRB 230723B detected by SWIFT(trigger 1180410)\nwith telescope of Nastro Verde Observatory - Sorrento (Naples), Italy. Member of: \nAAVSO - American Association of Variable Star Observers.\nUAI/SSV - Unione Astrofili Italiani/sezione stelle variabili.\nAstroCampania Associazione\n\nThe observations started at 19:19 UT of  2023/07/23, after 7,40 hours after the GRB trigger, at the end of twilight\nwith principal telescope  SC 0.35 f/10 with focal reduced + CCD Sbig ST10 XME\nI took 32 image of 60 sec each. All images are unfiltered, calibrated with masterdark and masterflat,stacked with Tycho Tracker software\nWe have not detected any clearly visible sources, up to 20th magnitude with clear skies.\n   Start T0+                  End T0+        Rlim\n19:19:39 UT            19:54:47 UT      20\n\nWe did not found any optical counterpart in the error box of the XRTcandidate.\nPage et al. GCN 34234\n\n\n\nMagnitudes were estimated with the Gaia DR2 cat. and \nare not corrected for galactic dust extinction.\n\n\n\nThe message may be cited.",
  "eventId": "GRB 230723B",
  "subject": " GRB 230723B: Osservatorio Astronomico Nastro Verde upper limit",
  "submitter": "Nello Ruocco at Osservatorio Nastro Verde - Sorrento (Naples) - Italy - MPC Code C82 <osservatorionastroverde@gmail.com>"
}