{
  "bibcode": "2020GCN.27574....1B",
  "body": "S. Belkin (IKI), A. Pozanenko (IKI), R. Ya. Inasaridze (AbAO), V.R. \nAyvazian (AbAO),  G. V.  Kapanadze (AbAO),   E. Mazaeva (IKI), A. \nVolnova  (IKI),  I. Molotov (KIAM) report on behalf of  GRB IKI FuN:\n\nWe observed the field of GRB 200412B (Fermi GBM team, GCN 27547; Mailyan\net al., GCN 27558; see also Burgess et al., GCN 27548; Longo et al., GCN\n27557; Page et al., GCN 27561; Gupta et al., GCN 27563; Zheng et al., \nGCN 27565)  with AS-32 (0.7m) telescope of Abastumani Observatory \nstarting on 2020-04-14 (UT) 00:16:57.  We  clearly detected  the \nafterglow of GRB 200412B  (Lipunov et al., GCNs 27555, 27556; Kumar et \nal., GCN 27564; Belkin et al., GCN 27566, Stecklum et al., GCN 27567,\nMoskvitin GCN 27570; Xin  et al., GCN 27571).  Preliminary photometry of \nthe afterglow is following.\n\nDate       UT start  t-T0    Filter Exp.  OT    Err. UL\n                     (mid, days)     (s)\n2020-04-14 00:16:57  1.65401 R      67*60 20.7 0.1   22.1\n\nThe photometry is based on nearby USNO-B1.0 stars\nUUSNO-B1.0_id R2\n1525-0302108 17.21\n1524-0300914 17.20\n1525-0301929 17.85\n\nThe index of power law decay of the afterglow light curve between the \ntwo epochs of our observations (Belkin et al., GCN 27566 at 0.41793 \ndays) and reported in this circular (at 1.65401 days) is -1.58+/-0.07 \nwhich is corroborate with the index reported by Xin  et al. (GCN 27571).",
  "circularId": 27574,
  "createdOn": 1586859561000,
  "email": "apozanen@iki.rssi.ru",
  "subject": "GRB 200412B: contunued AbAO optical observations",
  "submitter": "Alexei Pozanenko at IKI, Moscow  <apozanen@iki.rssi.ru>",
  "eventId": "GRB 200412B"
}