{
  "subject": "GRB 230818A: Leavitt Observatory upper limit",
  "submittedHow": "web",
  "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 observed the field of GRB 230818A (Fermi: GBM team, GCN 34478; Swift: Tohuvavohu et al., GCN 34479; Gompertz et al., GCN  34480; Moskvitin et al., GCN 34483; Malesani  et al., GCN 34485; Siegel et al., GCN 34486; Pankov et al., GCN 34487; Quadri et al., GCN 34488) with the telescope of Leavitt Observatory, Italy. Member of: \n\nUAI/SSV - Unione Astrofili Italiani/sezione stelle variabili, GRB section.\nATA - Associazione Tuscolana di Astronomia.\n\nThe observations began at 00:57 UT on 2023/08/18, 90 min after the GRB trigger, with our RC telescope D=250 mm F/D=8.\n\nWeather conditions were good.\n\nWe took 32 images of 120 sec each. All images are V filtered, calibrated with master dark and master flat, stacked with ASTAP software.\n\nWe have not detected any clearly visible sources, up to 19.60 magnitude with clear sky at \nRA (J2000): 19h 03m 33.08s\nDec (J2000): +40d 53' 48.0\"\n\non a field of view 31.1 x 26.8 arcmin.\n\nStart\t\tEnd\t\tVlim\n90 min\t\t154 min\t19.60\n\nThe magnitude limit was estimated with nearby stars from the Gaia EDR3 Catalog and is not corrected for galactic dust extinction.\n\nThe message may be cited.  ",
  "circularId": 34490,
  "createdOn": 1692460102237,
  "submitter": "leavittob@gmail.com",
  "bibcode": "2023GCN.34490....1P",
  "eventId": "GRB 230818A"
}