{
  "bibcode": "2015GCN.17671....1R",
  "body": "V. Rumyantsev (CrAO), K. Antoniuk  (CrAO), E. Mazaeva (IKI),  A. Pozanenko \n(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 AZT-11 telescope of CrAO observatory starting on Mar. 23 (UT) 20:09:58. \nWe obtained ages in R-filter of 180 s exposure under non-optimal weather \nconditions and mean FWHM of about 4.7 arcsec. In the enhanced XRT  position \n(Osborne et al., GCN 17633)  we do not detect  any object. In particular we \ndo no detect optical afterglow (Xu et al. GCN 17625, Xin et al. GCN 17631; \nWatson et al. GCN 17632). An upper limit is following\n\nDate              UT start,    t-t0          Filter   Exp.     OT   UL (3 \nsigma)\n                                        (mid, days)         (s)\n\n2015-03-23 20:09:58   0.14949  R        20*180  n/d  21.0\n\nThe photometry is based on nearby USNO-B1.0  stars.",
  "circularId": 17671,
  "createdOn": 1428146611000,
  "email": "apozanen@iki.rssi.ru",
  "subject": "GRB 150323C: CrAO optical observations",
  "submitter": "Alexei Pozanenko at IKI, Moscow  <apozanen@iki.rssi.ru>",
  "eventId": "GRB 150323C"
}