{
  "bibcode": "2023GCN.33528....1P",
  "body": "N. Pankov (HSE), E. Klunko (ISTP), A. Pozanenko (IKI), S. Belkin (IKI) \nreport on behalf of GRB IKI FuN:\n\nWe observed  the field of Swift GRB 230328B (Gropp et al. GCN 33527) \nwith AZT-33IK telescope of Mondy observatory  in  R-filter on\n2023-03-28 starting (UT) 15:27:18. We clearly detect the optical \nafterglow of GRB 230328B (Gropp et al. GCN 33527) at the position of \n(J2000) 19 24 01.828 +80 00 34.53 with an error of 0.5 arcsec in both \ncoordinates, which coincides with the position of UVOT (Gropp et al. GCN \n33527).\n\nPreliminary photometry  of a stack of the first 5 images is following\n\nDate       UT start  t-T0     Exp.  Filter   OT     Err.  UL(3sigma)\n                    (mid, days)  (s)\n\n2023-03-28  15:27:18   0.026047 5*60 R        18.9  0.2   21.1\n\nThe photometry is based on nearby USNO-B1.0 stars.",
  "circularId": 33528,
  "createdOn": 1680021115000,
  "email": "apozanen@iki.rssi.ru",
  "subject": "GRB 230328B: Mondy optical afterglow confirmation",
  "submitter": "Alexei Pozanenko at IKI, Moscow  <apozanen@iki.rssi.ru>",
  "eventId": "GRB 230328B"
}