{
  "circularId": 34436,
  "subject": "GRB 230812B: Iota Scorpii Observatory, La Spezia, Italy",
  "eventId": "GRB 230812B",
  "submitter": "GIULIO SCARFI at IOTA SCORPII OBSERVATORY <terziaria@gmail.com>",
  "bibcode": "2023GCN.34436....1S",
  "body": "Giulio Scarfì  (Iota Scorpii Observatory, La Spezia,Italy)\nmail terziaria@gmail.com\n\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)\n\nMembers of:\n\nGAD - Gruppo Astronomia Digitale.\nAAVSO - American Association of Variable Star Observers.\nUAI/SSV - Unione Astrofili Italiani/sezione stelle variabili-GRB.\n\nreport:\n\nI have observed the field of GRB 230812B (Lesage et al., GCN 34387;\nScotton et al., GCN 34392; Page, GCN 34394; Zheng & Filippenko, GCN\n34395; Lipunov et al., GCN 34396; Salgundi et al., GCN 34397; Ackley\net al., GCN 34398; Xiong et al., GCN 34401; Casentini et al., GCN\n34002; Frederiks et al., GCN 34403; Mao et al., GCN 34404; Odeh et\nal., GCN 34405; Moskvitin & Spiridonova GCN 34406; Leonini et al. GCN\n34408; de Ugarte Postigo et al. GCN 34409; de Ugarte Postigo et al.\nGCN 34410; Belkin et al. GCN 34412; Ruocco et al. GCN 34413; Frederiks\net al. GCN 34414; Ruocco et al. GCN 34415; Shrestha et al. GCN 34416;\nQuadri et al. GCN 34417; Adami et al. GCN 34418; Moretti et al. GCN\n34419; Kumar et al. GCN 34420; Belkin et al. GCN 34421 & GCN 34423;\nPyshna et al., GCN 34425) with my 0.40-m Ritchey-Cretien telescope.\n\nThe observations started 1660 min after the GRB trigger, at the end of\ntwilight,\nwith a Ritchey Cretien D=406 mm with reducer F/D=6,15.\nWeather conditions were good.\n\n\nAdd 12 x 300 sec. unfiltered images on August 13 2023,\nfrom 20:26:35 to 21:21:42 UT\n\n\nStart T0+      End T0+       R lim\n1660 min        1735 min         20\n\n\nI confirm a fading afterglow\n\n\nThe results of photometry are:\n\n\n      JD         mag      Err   Flt\n\n2460170.36555307   19.85  +/- 0.2   CLEAR\n\n\nMagnitudes were estimated with the Atlas catalog and\nare not corrected for galactic dust extinction.\n\n\n\nReference:\nhttp://www.iotascorpiiobservatory.it\n\n\n\nThe message may be cited.\n\n",
  "createdOn": 1692108562056,
  "submittedHow": "email-legacy"
}