{
  "bibcode": "2017GCN.21401....1T",
  "body": "N.Tyurina, V. Lipunov, E. Gorbovskoy, V.Kornilov, D.Kuvshinov, \nA.V.Krylov, I.Gorbunov, P.Balanutsa, A.Kuznetsov, V.V.Chazov, D. Vlasenko\nLomonosov Moscow State University, Sternberg Astronomical Institut of MSU\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\nO.Gres, K.Ivanov, S.Yazev, N.M.Budnev, O.Gres, O.Chuvalaev, V.A.Poleshchuk,\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\nWe found additional image in MASTER-IAC DataBase with more early time.\nSo the begining of our GCN Circular #21391 must be readed \nas:\n\nMASTER II  robotic telescope (MASTER-Net: http://observ.pereplet.ru) \nlocated in IAC was pointed to the  GRB170728B 19 sec after notice time \nand 30 sec after trigger time at 2017-07-28 23:03:49 UT. On our first (10s \nexposure)  image we found optical transient  within SWIFT \nerror-box (Cenko et al., GCN Circ. #21371).\nThe 5-sigma upper limit has been about 16.6 mag\n\nThe message may be cited.",
  "circularId": 21401,
  "createdOn": 1501576332000,
  "email": "lipunov@xray.sai.msu.ru",
  "subject": "GRB 170728B: time correction to MASTER GCN Circular 21391",
  "submitter": "Vladimir Lipunov at Moscow State U/Krylov Obs  <lipunov@xray.sai.msu.ru>",
  "eventId": "GRB 170728B"
}