{
  "bibcode": "2017GCN.20514....1L",
  "body": "V. Lipunov, E. Gorbovskoy, E.Popova, N.Tyurina, V.Kornilov, D.Kuvshinov, \nN.Tyurina, A.V.Krylov, I.Gorbunov, P.Balanutsa,\nA.Kuznetsov, V.V.Chazov, D.Vlasenko\nLomonosov Moscow State\nUniversity, Sternberg Astronomical Institut of MSU\n\nV.Yurkov, Yu.Sergienko\nBlagoveschensk Educational State University, Blagoveschensk\n\nK.Ivanov, S.Yazev, N.M.Budnev, O.Gres, O.Chuvalaev, V.A.Poleshchuk,\nO. Ershova\nIrkutsk State University\n\nA. Tlatov, V.Senik, A.V. Parhomenko, D. Dormidontov\nKislovodsk Solar Station of the Pulkovo Observatory\n\nR.Podesta, C.Lopez, F. Podesta Observatorio Astronomico Felix Aguilar (OAFA) , \nNational University of San Juan, Argentina\n\nH. Levato, C. Saffe\nInstituto de Ciencias Astronomicas,de la Tierra y del Espacio (ICATE),\nSan Juan, Argentina\n\nD.Buckley, S. Potter, A.Kniazev, M.Kotze\nSouth African Astronomical Observatory\n\nR. Rebolo, M. Serra, N. Lodieu, G. Israelian, L. Suarez-Andres\nThe Instituto de Astrofisica de Canarias\n\n\nMASTER II  robotic telescope (MASTER-Net: http://observ.pereplet.ru) located in \nBlagoveschensk was pointed to the  Fermi trigger Number 506702667 \n(Hamburg et al., 20505)  72 sec \nafter notice time and 171 sec after trigger time at 2017-01-21 14:47:14 UT.\n\nMASTER-Amur auto-detection system discovered MASTER OT J045017.73-091602.0\nwith unfiltered magnitude is 14.9m (limit 16.0 m) (Lipunov et al., GCN 20502).\n\nWe do not see any optical source at Swift XRT position (Sbarufatti et \nal., GCN 20510) with next limits:\n\n  Date         UT        Exp        Type        Limit\n             start\n\n2017-01-21 14:50:48 \t60\tAlert (FERMI)\t16.6\n\n2017-01-21 14:49:21     60\tAlert (FERMI)\t16.1\n\n2017-01-21 14:48:11     40\tAlert (FERMI)\t16.4\n\n2017-01-21 14:47:14     30\tAlert (FERMI)\t16.0\n\n2017-01-21 14:46:28     20\tAlert (FERMI)\t16.0\n\n\nThe message may be cited.",
  "circularId": 20514,
  "createdOn": 1485266720000,
  "email": "lipunov@xray.sai.msu.ru",
  "subject": "GRB 170121B:  MASTER early optical observations of the Swift possible XT",
  "submitter": "Vladimir Lipunov at Moscow State U/Krylov Obs  <lipunov@xray.sai.msu.ru>",
  "eventId": "GRB 170121B"
}