{
  "bibcode": "2023GCN.33530....1B",
  "body": "S. Belkin (IKI), R. Ya. Inasaridze (AbAO), E. Klunko (ISTP), A. \nNovichonok (Petrozavodsk State University, KIAM), A. Pozanenko (IKI), N. \nPankov (HSE, IKI), D. Datashvili (AbAO), V. R. Ayvazian (AbAO),  G. V. \nKapanadze (AbAO)  report on behalf of GRB IKI FuN:\n\nWe observed the field of Swift GRB 230328B (Gropp et al. GCN 33527; \nOsborne et al. GCN 33529) till now  with AZT-33IK telescope of Mondy \nobservatory  in  R-filter, RC-36 telescope of Kitab observatory in \nClear, AS-32 telescope of Abastumani observatory in R-filter. The \noptical afterglow (Gropp et al. GCN 33527; Pankov et al. GCN 33528) is \ndetected in Mondy and Abastumani, and not detected in Kitab observatory.\n\nPreliminary photometry  of a stacked  images is following\n\n\nDate       UT start   t-T0    Filter Exp.    OT    Err.  UL(3sigma)\n                       (mid, days)    (s)\n\n2023-03-28  16:19:20  0.062188  R      5*120    19.34  0.10   21.0\n2023-03-28  16:37:07  0.042338  Clear 19*60     n/d    n/d    17.6\n2023-03-28  16:15:48  0.086725  R    104*60     19.50  0.10   21.2\n\n\nThe photometry is based on nearby USNO-B1.0 stars.\n\nApproximation of above photometry in R-filter and photometry reported \nearly (GCN 33528) results in the power law index of -0.45 of slow decay \nLC of GRB 230328B.",
  "circularId": 33530,
  "createdOn": 1680039625000,
  "email": "apozanen@iki.rssi.ru",
  "subject": "GRB 230328B: Mondy, AbAO and Kitab optical observations",
  "submitter": "Alexei Pozanenko at IKI, Moscow  <apozanen@iki.rssi.ru>",
  "eventId": "GRB 230328B"
}