{
  "bibcode": "2016GCN.18891....1M",
  "body": "E. Mazaeva (IKI), R. Inasaridze (AbAO), V. Ayvazian (AbAO), A. Volnova \n(IKI), I. Molotov (KIAM), A. Pozanenko (IKI) report on behalf of larger \nGRB follow-up collaboration:\n\nWe observed the field of the Swift  GRB 151228B (Lien et  al., GCN \n18739) with AS-32 (0.7m) telescope of Abastumani Observatory starting on \nDec. 29 (UT) 14:38:28.  We do not detect any source within\nenhanced XRT error circle (Goad et al., GCN 18743):\n\nDate       UT start     t-T0          Filter Exp.    UL(3 sigma)\n            (mid, days)                       (s)\n\n2015-12-29 14:38:28     0.69297       None  35*120   22.1\n\nThe photometry is based on nearby SDSS-DR9 stars:\nSDSS-DR9_id             R_Lupton\nJ225738.02+080336.8 18.18\nJ225747.18+080340.7 16.86\nJ225736.71+080628.4 17.72\nJ225752.89+080438.1 17.46\nJ225726.79+080540.6 16.99",
  "circularId": 18891,
  "createdOn": 1453152180000,
  "email": "apozanen@iki.rssi.ru",
  "subject": "GRB 151228B: AbAO optical upper limit",
  "submitter": "Alexei Pozanenko at IKI, Moscow  <apozanen@iki.rssi.ru>",
  "eventId": "GRB 151228B"
}