{
  "bibcode": "2011GCN.11837....1V",
  "body": "A. Volnova (SAI MSU), A. Pozanenko (IKI), E. Klunko (ISTP) on behalf of \nlarger GRB follow up collaboration report:\n\nWe observed the field of GRB 110328A / Swift J164449.3+573451 (Cummings et \nal. GCN 11823) with AZT-33IK telescope of Sayan observatory (Mondy) starting \non March 28 (UT) 13:46:35, i.e. 6 minutes after second trigger (Barthelmy et \nal. GCNC 11824).\nWe identified the optical counterpart (Cenko et al. GCN 11827, Leloudas et \nal. GCN 11830) in the combined image of a total exposure of 67 min. The \nphotometry of the optical counterpart in the combined image is R=21.50 +/- \n0.10 and based on the USNO-A2.0 star 1425-08596694 assuming R=16.6. The \nphotometry is still preliminary and calibration of  field stars is necessary \n(Cenko et al. GCN 11827) to confirm the variable nature of the optical \ncounterpart.\n\n[GCN OPS NOTE(30apr11): Per author's request, Elunko was changed to Klunko.]",
  "circularId": 11837,
  "createdOn": 1301449538000,
  "email": "apozanen@iki.rssi.ru",
  "subject": "GRB 110328A / Swift J164449.3+573451: optical observations",
  "submitter": "Alexei Pozanenko at IKI, Moscow  <apozanen@iki.rssi.ru>",
  "eventId": "GRB 110328A"
}