{
  "bibcode": "2012GCN.12965....1I",
  "body": "K.Ivanov, S.Yazev, N.M.Budnev, E.Konstantinov, V.Lenok, O.Gres,\nO.Chuvalaev,\nV.A.Poleshchuk\nIrkutsk State University\n\n\nV.Krushinski, I.Zalozhnich,  A. Popov\nUral State University, Kourovka\n\n\nE. Gorbovskoy, V. Lipunov, V.Kornilov, D.Kuvshinov, A.Belinski, N.Tyurina, \nN.Shatskiy, P.Balanutsa, D.Zimnukhov, A.Kuznetsov, V.V.Chazov, P.V.Kortunov, \nA.Kuznetsov, M.Kornilov, A.Sankovich\nSternberg Astronomical Institute, Moscow State University\n\nV.Yurkov, Yu.Sergienko, D.Varda, E.Sinyakov\nBlagoveschensk Educational State University, Blagoveschensk\n\nA. Tlatov, A.V. Parhomenko, D. Dormidontov, V.Sennik\nKislovodsk Solar Station of the Pulkovo Observatory\n\nH.Levato, C.Mallamaci, C.Saffe\nICATE (Instituto de Ciencias Astronomicas, de la Tierra y del Espacio), San \nJuan, San Juan University, Felix Aguilar Observatory, Argentina\n\nMASTER II  robotic telescope (MASTER-Net: http://observ.pereplet.ru)\nlocated in Tunka was pointed to the  GRB120219A (Swenson et\nal., GCN Circ 12964) 22 sec s after notice\ntime and 105 sec after GRB time at 2012-02-19 14:31:54 UT. On our\nfirst (20s exposure, two \"ra\" and \"dec\"  polarisation\norientations) set we haven`t found optical\ntransient  within SWIFT XRT error-box.\nThe 5-sigma upper limit in two polarizations has been about 17.3mag and\n17.0 correspondingly.\n\n\nMASTER II  robotic telescope (MASTER-Net: http://observ.pereplet.ru)\nlocated in Kourovka (Ural)  was pointed to the  GRB120219A (Swenson et \nal., GCN Circ 12964) 26 sec s after notice\ntime and 109 sec after GRB time at 2012-02-19 14:31:58 UT. On our\nfirst (20s exposure, diagonal polarisation) set we haven`t found optical\ntransient  within  SWIFT XRT error-box.\nThe 5-sigma upper limit has been about 17.0 mag\n\n\nOne   MASTER Very Wide Field Camera located at Tunka\n(D=68 mm, 420 square degrees, 11 Mpx) was observed  GRB error box\nwith 5 s exposure  befoure, during and after GRB Trigger Time\nwithout time gap between images.\n\nOur unfiltered images are calibrated relative to Tycho stars (V).\nThe magnitude limit of the each emage is  11.5 m at the edge of FOW.\nWe do not detect OT.\nBut we need the duration and beginning time of the GRB.\nThe redaction is continuated.\n\nThe message may be cited.",
  "circularId": 12965,
  "createdOn": 1329671679000,
  "email": "gcncirc@observ.inetcomm.ru",
  "subject": "GRB 120219A: MASTER-NET prompt and early optical observations",
  "submitter": "Vladimir Lipunov at Moscow State U/Krylov Obs  <gcncirc@observ.inetcomm.ru>",
  "eventId": "GRB 120219A"
}