{
  "bibcode": "2015GCN.17341....1E",
  "body": "L. Elenin (KIAM),  E. Mazaeva (IKI), A. Volnova (IKI), I. Molotov \n(KIAM), A. Pozanenko (IKI) report on behalf of larger GRB  follow-up \ncollaboration:\n\nWe observed the field of the Swift GRB 150120A (D'Elia et al.,\nGCN 17310) with 0.4-m telescope of ISON-NM observatory in robotic mode \nstarting on Jan., 20 (UT) 02:58:58, i.e. 72 seconds after burst trigger. \nWe obtained 60 unfiltered images of 30 s exposure. We do not detect any \nsource within enhanced XRT error circle (Evans et al., GCN 17317):\n\nDate      UT start   t-T0         Exp.    Filter  UL (3sigma)\n                      (mid.,days)    (s)\n2015-01-20 02:58:58  0.00227      5*30    Clear   19.0\n2015-01-20 02:58:58  0.01950     60*30    Clear   20.2\n\n\nThe photometry is based on nearby SDSS DR9 stars\n\nSDSS9_id                R_Lupton\nJ004136.43+340051.9     15.61\nJ004135.94+335950.0     14.56\nJ004101.23+335851.1     15.84",
  "circularId": 17341,
  "createdOn": 1421864536000,
  "email": "apozanen@iki.rssi.ru",
  "subject": "GRB 150120A: ISON-NM early optical limit",
  "submitter": "Alexei Pozanenko at IKI, Moscow  <apozanen@iki.rssi.ru>",
  "eventId": "GRB 150120A"
}