{
  "bibcode": "2015GCN.17564....1V",
  "body": "E. Vazaeva (IKI), V. Nevskiy (ISON), A. Volnova (IKI), I. Molotov \n(KIAM), A. Pozanenko (IKI),report on  behalf of larger collaboration:\n\nWe observed the field of the Swift GRB 150309A (Cummings et al., GCN \n17553) with Santel-400AN   telescope of ISON-Kislovodsk observatory \nstarting on Mar. 09 (UT) 23:11:26, i.e. ~8.5 min after the burst \ntrigger. In the enhanced XRT position (Osborne et al., GCN 17555) we do \nnot detect any object. An upper limit is following\n\nDate       UT start   t-T0    Filter   Exp.     UL(3 sigma)\n                      (mid, days)        (s)\n\n2014-09-03 23:11:26  0.02590  None     49*60    20.0\n\nThe photometry is based on USNO-B1.0 star\n\nUSNO-B1.0_id  R2\n\n1764-0030460  15.42",
  "circularId": 17564,
  "createdOn": 1426077327000,
  "email": "apozanen@iki.rssi.ru",
  "subject": "GRB 150309A: ISON-Kislovodsk optic upper limit",
  "submitter": "Alexei Pozanenko at IKI, Moscow  <apozanen@iki.rssi.ru>",
  "eventId": "GRB 150309A"
}