{
  "bibcode": "2012GCN.12977....1G",
  "body": "E. Gorbovskoy, V. Lipunov, V.Kornilov, D.Kuvshinov, A.Belinski, N.Tyurina,\nN.Shatskiy, P.Balanutsa, D.Zimnukhov, A.Kuznetsov, V.V.Chazov, \nA.Kuznetsov,  A.Sankovich\nSternberg Astronomical Institute, Moscow State University\n\nK.Ivanov, S.Yazev, N.M.Budnev, O.Gres, O.Chuvalaev, V.A.Poleshchuk\nIrkutsk State University\n\nV.Krushinski, I.Zalozhnich,  A. Popov\nUral State University, Kourovka\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\nHugo Levato and Carlos Saffe\nInstituto de Ciencias Astronomicas, de la Tierra y del Espacio (ICATE)\nClaudio Mallamaci, Carlos Lopez and Federico Podest\nObservatorio Astronomico Felix Aguilar (OAFA)\n\nMASTER II  robotic telescope (Global MASTER-Net: \nhttp://observ.pereplet.ru)\nlocated in Tunka and Ural  was pointed to the  GRB120219A (Swenson et\nal., GCN Circ 12964; Ivanov et al., GCN Circ 12965).\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  before, during and after GRB Trigger Time\nwithout time gap between images.\nOur unfiltered images are calibrated relative to Tycho stars (V).\n\nWe haven`t found optical transient  within enhanced SWIFT XRT error-box \n(Goad et al., GCN Circ 12967).\n\nOur results:\n\nT_start-T_trig    T_mean-T_trig   Limit  Coadd  Telescope   Filter   Site\n      (s)                   (s)\n\n      -9                -6.5       11.5     No    VWFC (E)   Unfilt   Tunka\n      -4                -1.5       11.5     No    VWFC (E)   Unfilt   Tunka\n      -9                33.5       13.0     18    VWFC (E)   Unfilt   Tunka\n     105                115        17.3     No   MASTERII(E)    P|    Tunka\n     105                115        17.0     No   MASTERII(W)    P-    Tunka\n     105                772        19.5     22   MASTERII(E+W)Unfilt  Tunka\n     109                119        17.0     No   MASTERII(W)    P/     Ural\n     109                552        19.0     11   MASTERII(W)    P/     Ural\n\nThere is some marginal object at Xin et al.(GCN 12966) OT candidate \nposition in Ural and Tunka added images with ~19 and ~20 mag \ncorrespondingly (see images). The some marginal object appear on Very Wide \nField Camera at -1.5 s (mean time) and +3.5s images with 12 mag (pixel is equal 22\"). \nBut the signal/noice level is 2-3 sigma and we can not confirm or reject \nthis candidate.\n\nThe images and video are available at \nhttp://master.sai.msu.ru/static/GRB120219A/GRB120219A.html .\n\nThe magnitudes in the table are not corrected for the Galactic extinction\ndue to the reddening of E(B-V) = 0.03 in the direction of the burst\n(Schlegel et al. 1998).\n\n\n\n\nThe message may be cited.",
  "circularId": 12977,
  "createdOn": 1329815040000,
  "email": "gcncirc@observ.inetcomm.ru",
  "subject": "GRB 120219A: MASTER prompt and early optical limit and OT discussion",
  "submitter": "Vladimir Lipunov at Moscow State U/Krylov Obs  <gcncirc@observ.inetcomm.ru>",
  "eventId": "GRB 120219A"
}