{
  "bibcode": "2014GCN.16312....1V",
  "body": "V. Vladimirov, P.Balanutsa, E. Gorbovskoy, V. Lipunov, V.Kornilov, \nD.Kuvshinov, A.Belinski, N.Tyurina,\nN.Shatskiy,  D.Zimnukhov, A.Kuznetsov, V.V.Chazov, D.Denisenko, \nA.Sankovich, A. Krylov, M.Pruzhinskaya\nLomonosov Moscow State University,\nSternberg Astronomical Institute, Moscow 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\nK.Ivanov, S.Yazev, N.M.Budnev, O.Gres, O.Chuvalaev, V.A.Poleshchuk\nIrkutsk State University\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\nMASTER II  robotic telescope (MASTER-Net: http://observ.pereplet.ru) \nlocated in  Vostryakovo (Alexander Krylov Observatory) was pointed to the \nGRB140521A 4553 sec after trigger time at 2014-05-21 18:50:11 directly \nafter sunset.  We haven`t found optical transient  within SWIFT error-box \n(Troja et. al GCN 16311) on single and coadd images.\nIn table 1 the images upper limits are provided.\n\nTable 1.\n-------\nT_start \t     Exptime   T-T_mead  T-T_start  T-T_stop  Filter  mlimit  Coadd\n2014-05-21 18:50:11     15       4561       4553      4568     C      14.5     1*\n2014-05-21 19:10:18    600       6531       5760      7302     C      18.0     10\n2014-05-21 19:10:18   1020       7210       5760      8659     C      18.8     17\n2014-05-21 19:38:52    600       8067       7474      8659     C      18.7     10\n2014-05-21 20:07:53   1200      10390       9215     11566     C      19.4     20\n-----------------------------------------------------------------------------------\n* First image with stars on bright evening sky.\nC is  our white (clear) band which is well described by a parity 0.8R+0.2B (USNO B1).\nT is a  GRB trigger time.\n\n\nAnother  two  MASTER II  robotic telescope  located in Kislovodsk and  Blagoveschensk\nwas pointed to the  GRB140521A 21 sec after notice time and 36 sec after \ntrigger time at 2014-05-21 17:34:54 UT. But observations were spoiled due \nto bad weather condition.  We have a set of images from that observatories \nwith different exposures from 10 to 180 and formal upper limit from 13 to \n16 during first hour after the burst. However bad quality of images (due \nto wind and clouds) don't allow to carry out transient search.\n\nThe message may be cited.",
  "circularId": 16312,
  "createdOn": 1400711289000,
  "email": "gcncirc@observ.inetcomm.ru",
  "subject": "GRB 140521A: MASTER  optical observations",
  "submitter": "Vladimir Lipunov at Moscow State U/Krylov Obs  <gcncirc@observ.inetcomm.ru>",
  "eventId": "GRB 140521A"
}