{
  "bibcode": "2020GCN.27318....1P",
  "body": "A. Pozanenko (IKI), S. Belkin (IKI), R. Ya. Inasaridze (AbAO),  E. \nKlunko (ISTP), A. Kusakin (FAPHI),  I. Reva (FAPHI), V. Rumyantsev \n(CrAO), E. Mazaeva (IKI), A. Volnova (IKI) report on behalf of IKI-GRB-FuN:\n\nWe continue observations of the OT (Pozanenko et al., GCN 27276) \nassociated with GRB 200228B (Laha et al., GCN 27254; Fermi GBM Team, GCN \n27253) with AZT-33IK 1.5-m telescope of Sayan observatory (Mondy) and \nAS-32 telescope of Abastumani Astrophysical observatory. The OT is well \nobservable (see photometry below in the table) and current XRT position \n( https://www.swift.ac.uk/xrt_positions/00958733/ ) coincides with \nposition of the OT.\n\nPreliminary photometry of the object following.\n\nDate UT start       t-T0  Filter Exp. OT Err UL(3sigma)   telescope\n                         (mid, days) (s)\n2020-03-03 01:36:36 3.6186   R 58*60  21.65 0.13  22.6 AS-32\n2020-03-03 21:03:33 4.4228   R 20*120 22.2  0.4   22.0 AZT-33IK\n2020-03-04 23:44:59 5.5488   R 80*60  21.93 0.17  22.6 AS-32\n\nPhotometry is based on the USNO-B2.0 nearby stars used in previous \nobservations (GCN 27276).\n\nThe light curve in R-filter is available at \nhttp://grb.rssi.ru/GRB200228B/GRB200228B_lc_2.png\n\nWe urge on spectroscopic and multicolor photometry to classify the OT.",
  "circularId": 27318,
  "createdOn": 1583431659000,
  "email": "apozanen@iki.rssi.ru",
  "subject": "GRB 200228B: continued optical observations",
  "submitter": "Alexei Pozanenko at IKI, Moscow  <apozanen@iki.rssi.ru>",
  "eventId": "GRB 200228B"
}