{
  "bibcode": "2023GCN.33559....1P",
  "body": "N. Pankov (HSE), L. Elenin (KIAM RAS), A. Krylov (KIAM RAS), A. \nPozanenko (IKI), S. Belkin (IKI) report on behalf of GRB IKI FuN:\n\nWe observed  the field of GRB 230328B (Gropp et al. GCN 33527; Veres et \nal., GCN 33526; Dalessi et al., GCN 33531; Waratkar et al., GCN 33532; \nDafcikova  et al., GCN 33543; Svinkin  et al. GCN  33544) with \nSantel-400 (0.4m) telescope of ISON-Multa observatory (Altay Republic) \nin  Clear filter on 2023-03-28 starting on (UT) 15:16:06. We detect the \noptical afterglow of GRB 230328B (Gropp et al. GCN 33527; Pankov et al. \nGCN 33528; Belkin et al. GCN 33530; Lu et al. GCN 33534; Catapano et al. \nGCN  33535; Suresh et al. GCN 33536; Adami  et al. GCN 33537; Gompertz \net al. GCN 33538; Komesh  et al. GCN 33539; Lu et al. GCN 33540; Ror et \nal. GCN 33547; Kugel  et al. GCN 33550; Siegel et al. GCN 33556).\n\nPreliminary photometry  of the afterglow source is following\n\nDate        UT start  t-T0    Exp.  Filter   OT    Err.  UL(3sigma)\n                    (mid, days) (s)\n\n2023-03-28  15:16:06 0.04603  90*60 Clear    18.9  0.1   20.0\n\nThe photometry is based on nearby USNO-B1.0 (R2) stars.",
  "circularId": 33559,
  "createdOn": 1680565893000,
  "email": "apozanen@iki.rssi.ru",
  "subject": "GRB 230328B: Multa observatory optical afterglow observation",
  "submitter": "Alexei Pozanenko at IKI, Moscow  <apozanen@iki.rssi.ru>",
  "eventId": "GRB 230328B"
}