{
  "bibcode": "2017GCN.20893....1M",
  "body": "E. Mazaeva (IKI), A. Pozanenko (IKI), E. Klunko (ISTP), A. Volnova\n(IKI)  report on behalf of larger GRB follow-up collaboration:\n\nWe observed the field of  GRB 170317A (LaPorte et al., GCN  20885) with \nAZT-33IK telescope of Sayan observatory (Mondy) starting on  March, 17 \n(UT) 13:56:13. We obtained 60 of 60 s exposure images in R-filter.\nThe optical afterglow (LaPorte et al., GCN 20885; Mazaeva et al., GCN \n20886; Xin et al., GCN 20888; Mao  et al., GCN 20889) is clearly visible \nin stacked images. Preliminary photometry of the afterglow is following\n\nDate       UT start   t-T0    Filter  Exp.     OT     Err.  UL\n                      (mid, days)      (s)\n\n2017-03-17 13:56:13  0.18073  R      20*60    20.94  0.10  22.5\n\nThe photometry is based on nearby USNO-B.10 stars\nRef.stars\nUSNO_B1_id   R2\n1405-0167493 16.10\n1405-0167631 15.69\n1404-0169027 16.03\n1405-0167512 16.85\n1404-0169128 16.25",
  "circularId": 20893,
  "createdOn": 1489769281000,
  "email": "apozanen@iki.rssi.ru",
  "subject": "GRB 170317A: Mondy optical observations",
  "submitter": "Alexei Pozanenko at IKI, Moscow  <apozanen@iki.rssi.ru>",
  "eventId": "GRB 170317A"
}