{
  "bibcode": "2015GCN.17649....1M",
  "body": "E. Mazaeva (IKI), S. Schmalz (AIP), N. Tungalag (Research Center of \nAstronomy and Geophysics MAS),  A. Volnova (IKI), I.Molotov (KIAM), A. \nPozanenko (IKI) report on behalf of larger GRB follow-up collaboration:\n\nWe observed the field of GRB 150323B  (Cummings  et al., GCN 17619) with \nORI-40 telescope of Khureltogot observatory  starting on   Mar., 23 (UT) \n16:06:11. We obtained 60 unfiltered images of 60 s exposure. Following \ndetection of XRT sources (D'Avanzo et al., GCN 17634) we do not detect \nany source within XRT error circle of the source #1 up to a limiting \nmagnitude 21.2. In particular we do detect the optical source found by \nKelemen et al. (GCN 17643).  At the position of XRT source #2 we found \noptical source which coincides with USNO star mentioned by Xin et al. \n(GCN 17638) and the star of SDSS DR9 catalog J172150.45+381700.1.\n\nPhotometry of the sources is following\n\nSource#  Date       UT start  t-T0    Filter  Exp.   mag.    UL(3sigma)\n                              (mid, days)      (s)\n\n1       2015-03-23  16:06:11  0.29859  none   60*60  n/d          21.2\n2       2015-03-23  16:06:11  0.29859  none   60*60  20.7+/-0.25  21.2\n\nThe photometry is based on R magnitudes of nearby SDSS DR9 stars\n\nSDSS9_id               R(Lupton)\nJ172146.77+381659.6    15.65\nJ172126.47+382201.1    18.14\nJ172127.98+382239.0    15.39",
  "circularId": 17649,
  "createdOn": 1427482894000,
  "email": "apozanen@iki.rssi.ru",
  "subject": "GRB 150323B: Khureltogot optical observations",
  "submitter": "Alexei Pozanenko at IKI, Moscow  <apozanen@iki.rssi.ru>",
  "eventId": "GRB 150323B"
}