{
  "bibcode": "2017GCN.21044....1L",
  "body": "R.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\nV. Lipunov, E. Gorbovskoy, V.Kornilov, N.Tyurina, D.Kuvshinov, \nA.V.Krylov,  I.Gorbunov, P.Balanutsa, A.Kuznetsov, V.V.Chazov, D. Vlasenko\n\nLomonosov Moscow State University, Sternberg Astronomical Institut of MSU\n\nK.Ivanov, S.Yazev, N.M.Budnev, O.Gres, O.Chuvalaev, V.A.Poleshchuk, O. Ershova \nIrkutsk State University\n\nV.Yurkov, Yu.Sergienko\nBlagoveschensk Educational State University, Blagoveschensk\n\nA. Tlatov, V.Senik, A.V. Parhomenko, D. Dormidontov\nKislovodsk Solar Station of the Pulkovo Observatory\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\nMASTER II  robotic telescope (MASTER-Net: http://observ.pereplet.ru) \nlocated in OAFA was pointed to the  GRB170428.38 17 sec after notice time \nand 31 sec after trigger time at 2017-04-28 09:14:14 UT. On our first (10s \nexposure)  set we haven`t found optical transient  within SWIFT error-box \n(ra=330.062 dec=26.9172 r=0.05).\nThe 5-sigma upper limit has been about 16.5 mag\n\nThe observations made on zenit distance = 72 degrees, galaxy latitude b = \n-22 degree.\nThe moon ( 5 % bright part) below the horizon (The altitude of the Moon is \n-49 degree ).\nThe sun  altitude  is -24.2 degree.\nThe object can be observed till sunrise at 2017-04-28 11:06:50\n\nThe message may be cited.",
  "circularId": 21044,
  "createdOn": 1493392782000,
  "email": "lipunov@xray.sai.msu.ru",
  "subject": "GRB 170428A: MASTER-OAFA  early  optical observations",
  "submitter": "Vladimir Lipunov at Moscow State U/Krylov Obs  <lipunov@xray.sai.msu.ru>",
  "eventId": "GRB 170428A"
}