{
  "bibcode": "2011GCN.11889....1R",
  "body": "V. Rumyantsev (CrAO), A. Pozanenko (IKI), A. Volnova (SAI MSU) on behalf of \nlarger GRB follow up collaboration report:\n\nWe observed the field of GRB 110402A  (Ukwatta et al. GCN 11857) with Shajn \ntelescope of CrAO  observatory  on Apr. 3 between (UT) 18:41 and 19:59 under \nseeing of about 2.6 arsces. We took several frames with exposure of 60s in \nR-band. On a stacked image we detected the optical counterpart (Mundell et \nal. GCN 11858, Leloudas et al. GCN 11859). The counterpart has coordinates \n(J2000) RA = 13h 09m 36.63s, Dec = +61d 15' 09.5'' with uncertainty of 0.1\" \nin both coordinates which are fully compatible with initial counterpart \ncoordinates (Mundell et al. GCN 11858). The photometry is based on the USNO \nB1.0 star 1512-0199231 (13 09 43.16 +61 14 38.5) assuming R=16.71.\n\nT0+         Filter,   Exposure, mag.                uplim (3 sigma)\n(mid, d)               (s)\n\n1.79672  R         73x60       23.11+/-0.12  24.4",
  "circularId": 11889,
  "createdOn": 1302112256000,
  "email": "apozanen@iki.rssi.ru",
  "eventId": "GRB 110402A",
  "subject": "GRB 110402A: fading optical afterglow",
  "submitter": "Alexei Pozanenko at IKI, Moscow  <apozanen@iki.rssi.ru>"
}