{
  "bibcode": "2022GCN.31844....1P",
  "body": "N. Pankov (HSE),  A. Pozanenko (IKI),  E. Klunko (ISTP), S. Belkin (IKI) \n  report on behalf of GRB IKI FuN:\n\nWe observed the field of  GRB 220403B  (Klingler  et al., GCN 31820) \nwith AZT-33 telescope of Mondy observatory starting on April, 05  (UT) \n15:00:54.   We do not detect the optical afterglow (Klingler  et al., \nGCN  31820; Jelinek  et al., GCN 31821; Zhu  et al., GCN 31823; Rossi \net al., GCN 31826; Pankov et al., GCN 31837; Hu et al., GCN 31841; see \nalso early upper limits in Lipunov et al., GCN 31825; Grossan  et al., \nGCN 31830) in the combined image.\nPreliminary photometry of the  combined image is following\n\n  Date,      UT start, t-T0,   Exp.,  Filter, OT,    Err,  UL(3 sigma)\n                     (mid, days)\n\n2022-04-05  15:00:54 1.77723   20*120  R      n/d    n/d    23.2\n\nThe photometry is based on nearby USNO-B1.0 stars, R2 magnitude\nUSNO-B1.0_id R2\n1791-0003982 16.77\n1791-0003984 17.83",
  "circularId": 31844,
  "createdOn": 1649263021000,
  "email": "apozanen@iki.rssi.ru",
  "subject": "GRB 220403B: Mondy optical upper limit",
  "submitter": "Alexei Pozanenko at IKI, Moscow  <apozanen@iki.rssi.ru>",
  "eventId": "GRB 220403B"
}