{
  "bibcode": "2021GCN.29302....1P",
  "body": "N. Pankov (HSE), A. Pozanenko (IKI), E. Klunko (ISTP), S. Belkin (IKI) \nreport  on behalf of GRB IKI FuN:\n\nWe observed the field of GRB 210112A (Ambrosi  et al., GCN 29289; Ursi \net al., GCN #9293) with AZT-33IK telescope of Sayan observatory (Mondy) \nstarting on 2021-01-12 (UT) 20:41:40. The optical afterglow (Ambrosi  et \nal., GCN 29289; Kann  et al., GCNs 29296, 29300) is not detected in \nstacked  image in R-filter. The non detection of the afterlow is \nconsistent with other non-detections in R-filter (Novichonok  et al., \nGCN 29292; Gupta et al., GCN 29301).\n\nPreliminary photometry of the optical transient in a combined image is \nfollowing\n\nDate       UT start   t-T0       Filter Exp.    OT    Err.  UL(3sigma)\n                       (mid, days)        (s)\n\n2021-01-12 20:41:40   0.80738    R      18*120   n/d  n/d   22.4\n\n\nThe photometry is based on the nearby USNO-B1.0 stars.",
  "circularId": 29302,
  "createdOn": 1610569698000,
  "email": "apozanen@iki.rssi.ru",
  "subject": "GRB 210112A: Mondy optical observations",
  "submitter": "Alexei Pozanenko at IKI, Moscow  <apozanen@iki.rssi.ru>",
  "eventId": "GRB 210112A"
}