{
  "bibcode": "2020GCN.27240....1B",
  "body": "S. Belkin (IKI), A. Pozanenko (IKI), E. Klunko (ISTP), E. Mazaeva (IKI), \nA. Volnova (IKI) report on behalf of IKI-GRB-FuN:\n\nWe observed the field of GRB 200224A (Ukwatta  et al., GCN 27173; Fermi \nGBM team GCN 27174) with AZT-33IK telescope of Sayan observatory (Mondy) \nstarting on Feb. 26 (UT) 17:24:49. We did not detect the optical \nafterglow (Sota et al., GCN 27176; Stecklum et al., GCN 27177; Marshall \net al., GCN 27182; Becerra et al., GCN 27182; Fernandez et al., GCN \n27222). Preliminary photometry of the field is following.\n\nDate UT start,      t-T0    Filter Exp.   OT UL(3sigma)\n                     (mid, days)    (s)\n2020-02-26 17:24:49 2.60348 R      29*120 n/d 22.6\n\nPhotometry is based on the USNO-B1.0 nearby stars.",
  "circularId": 27240,
  "createdOn": 1582820926000,
  "email": "apozanen@iki.rssi.ru",
  "subject": "GRB 200224A: Mondy optical upper limit",
  "submitter": "Alexei Pozanenko at IKI, Moscow  <apozanen@iki.rssi.ru>",
  "eventId": "GRB 200224A"
}