{
  "bibcode": "2015GCN.17669....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 the GRB 150323C (Amaral-Rogers  et al., GCN 17621) \nwith ORI-40 telescope of Khureltogot observatory starting on Mar., 23 (UT) \n17:20:51, i.e. ~15 minutes after burst trigger. We obtained 180 unfiltered \nimages of 60 s exposure. Within  enhanced Swift-XRT error circle (Osborne et \nal., GCN 17633)  we detect optical afterglow (Xu et al. GCN 17625, Xin et \nal. GCN 17631; Watson et al. GCN 17632). Preliminary photometry of the \nafterglow in combined images is following\n\nDate        UT start  t-T0                  Filter      Exp.   OT  OT_err\n                       (mid, days)                              (s)\n\n2015-01-23  17:20:51  0.01449   none    10*60  21.1 0.3\n2015-01-23  17:31:40  0.02199   none    10*60  20.5 0.25\n2015-01-23  17:42:28  0.02950   none    10*60  20.8 0.25\n2015-01-23  17:53:17  0.03700   none    10*60  20.2 0.2\n2015-01-23  18:04:04  0.04451   none    10*60  20.0 0.2\n2015-01-23  18:14:54  0.06199   none    35*60  21.3 0.3\n2015-01-23  18:54:26  0.09409   none    39*60  21.0 0.3\n2015-01-23  19:57:04  0.13649   none    40*60  21.5 0.4\n\nPhotometry is based on SDSS DR9 stars:\n\nSDSS9_id                        R(Lupton)\nJ125026.13+501147.9  16.16\nJ125023.08+501048.2  16.84\n\nOur photometry confirms  non-monotonic behaiviour of a lighr curve of the \nafterglow mentioned by Xin et al. (GCN 17631).\nThe light curve of GRB 150323C afterglow can be found in \nhttp://grb.rssi.ru/GRB150323C/GRB150323C_ORI40_lc.png",
  "circularId": 17669,
  "createdOn": 1428145671000,
  "email": "apozanen@iki.rssi.ru",
  "subject": "GRB 150323C: Khureltogot optical observations",
  "submitter": "Alexei Pozanenko at IKI, Moscow  <apozanen@iki.rssi.ru>",
  "eventId": "GRB 150323C"
}