{
  "bibcode": "2015GCN.18427....1L",
  "body": "V. Lipunov, E. Gorbovskoy,   N.Tyurina, V.Kornilov, P.Balanutsa,\nA.Kuznetsov, D.Kuvshinov, D. Vlasenko\nLomonosov Moscow State University, Sternberg Astronomical Institute\n\nD.Buckley, S. Potter, A.Kniazev, M.Kotze\nSouth African Astronomical Observatory\n\nK.Ivanov, S.Yazev, N.M.Budnev, O.Gres, O.Chuvalaev, V.A.Poleshchuk\nIrkutsk State University\n\nA. Tlatov, A.V. Parhomenko, D. Dormidontov, V.Sennik\nKislovodsk Solar Station of the Pulkovo Observatory\n\nV.Yurkov, Yu.Sergienko, D.Varda, E.Sinyakov\nBlagoveschensk Educational State University, Blagoveschensk\n\n\nV.Krushinski, I.Zalozhnih,  A. Popov\nUral Federal University, Kourovka\n\nHugo Levato and Carlos Saffe\nInstituto de Ciencias Astronomicas, de la Tierra y del Espacio (ICATE)\n\nClaudio Mallamaci, Carlos Lopez and Federico Podest\nObservatorio Astronomico Felix Aguilar (OAFA)\n\n\n\nMASTER II  robotic telescope (MASTER-Net: http://observ.pereplet.ru) \nlocated in SAAO was pointed to the  GRB151021A 25 sec after notice time \nand 50 sec after trigger time at 2015-10-21 01:30:06 UT in two \npolarizations. On our first (10s exposure)  set we  found 1 optical \ntransient within SWIFT error-box (Melandri et. al GCN 18425) brighter then \n16.\n\n\ndate       time      Tmid-T0      Coord2000                       Mag\n2015-10-21 01:30:06   55.0   (22h 30m 34.42s , -33d 11m 50.3s)    14.86\n\nThe 5-sigma upper limit has been about 16.0 mag\nThe message may be cited.\n\n[GCN OPS NOTE(21oct15) Per author's request, the GBB name in the Subject-line\nwas changed from 0921A to 1021A.]",
  "circularId": 18427,
  "createdOn": 1445409961000,
  "email": "lipunov@xray.sai.msu.ru",
  "subject": "GRB 151021A: MASTER-NET bright OT detection",
  "submitter": "Vladimir Lipunov at Moscow State U/Krylov Obs  <lipunov@xray.sai.msu.ru>",
  "eventId": "GRB 151021A"
}