{
  "bibcode": "2017GCN.21173....1L",
  "body": "V. Lipunov, V.Kornilov, N.Tyurina, E.Gorbovskoy, D.Kuvshinov, A.V.Krylov,\nI.Gorbunov, P.Balanutsa, A.Kuznetsov, V.V.Chazov, D. Vlasenko\nLomonosov Moscow State University, Sternberg Astronomical Institut of MSU\n\nA. Tlatov, V.Senik, A.V. Parhomenko, D. Dormidontov\nKislovodsk Solar Station of the Pulkovo Observatory\n\nN.M.Budnev, O.Gres, O. Ershova \nIrkutsk State University\n\nA.Gabovich, V.Yurkov, Yu.Sergienko\nBlagoveschensk Educational State University, Blagoveschensk\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\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\n\nMASTER-Kislovodsk robotic telescope (2x4 square degrees, MASTER-Net: \nhttp://observ.pereplet.ru)  was pointed to the  GRB170531B (Evans et al.,\nGCN #21171)  12 sec after notice time and 452 sec after trigger \ntime on 2017-05-31 22:09:44 UT.\nThere is marginally seen optical transient at the position 19h 07m 32.03s \n-16d 25' 10.4\" with m_OT~19.0+-0.5\n\nThe 5-sigma upper limit is about 18.5mag\nThe message may be cited.\n\n\n====================================================================\n\n\n\nThe observations made on zenit distance = 64 degrees, galaxy latitude b = -11 degree.\nThe moon (44 % bright part) below the horizon (The Moon altitude is -6 degree).\nThe sun  altitude  is -22.7 degree.\nThe object can be observed till sunrise at 2017-06-01 01:30:50 .\n\n\n\nThe message may be cited.",
  "circularId": 21173,
  "createdOn": 1496272741000,
  "email": "lipunov@xray.sai.msu.ru",
  "subject": "GRB 170531B: MASTER Net  OT detection",
  "submitter": "Vladimir Lipunov at Moscow State U/Krylov Obs  <lipunov@xray.sai.msu.ru>",
  "eventId": "GRB 170531B"
}