{
  "bibcode": "2017GCN.20381....1L",
  "body": "V.M.  Lipunov, N.Tyurina, E. Gorbovskoy, V.G. Kornilov, P.Balanutsa, \nA.Kuznetsov, V.Shumkov, M.I.Panchenko \nLomonosov Moscow State University, Sternberg Astronomical Institute\n\nD.Buckley, S. Potter, M. Kotze South African Astronomical Observatory\n\nR. Rebolo, M. Serra-Ricart, G. Israelian, N.Lodiu\nThe Instituto de Astrofisica de Canarias\n\nA. Tlatov, V.Sennik\nKislovodsk Solar Station of the Pulkovo Observatory\n\nN.M. Budnev, O. Gress, K. Ivanov\nIrkutsk State University\n\nV.Yurkov, Yu.Sergienko, A.Gabovich\nBlagoveschensk Educational State University, Blagoveschensk\n\n\nGlobal MASTER Net was starting observations of the LIGO/Virgo G268556 \nerror field at 2017-01-04 15:46:07 UT during regular sky survey up to 20 \nunfiltered magnitude.\n\nAfter received alert circular (Shawhan et al.,20364) we started \nspecial inspection with \nMASTER-Amur, MASTER-Tunka, MASTER-Kislovodsk, MASTER-OAFA and MASTER-SAAO \ntelescopes.  We cover 50.2% initial probability now up to 20.5 mag.\n\n\nThe first OT  MASTER OT J090021.21+635049.7 detection ( Possible SN in \n1.797\"  from Sloan galaxy).\n\n\nMASTER-Kislovodsk auto-detection system discovered OT source at (RA, Dec) \n= 09h 00m 21.21s +63d 50m 49.7s on 2017-01-05.06666 UT.\nThe OT unfiltered magnitude is 18.6m+-0.2 (limit 19.9m).\n\nThe OT is seen in 4 image.\n\nWe have reference image without OT on 2012-10-20.91652 UT with unfiltered \nmagnitude limit 19.7m.\n\nNo known minor planets, brighter than V = 21.0, were found in the \n15.0-arcminute region around R.A. = 09 00 21.21, Decl. = +63 50 49.7 \n(J2000.0) on 2017 01 05.07 UT .\n\nOT is offset  1.79709\" from the Sloan galaxy rmag=19.96, gmag=20.64 \nhttp://skyserver.sdss.org/dr9/en/tools/chart/navi.asp?ra=135.08928453&dec=63.84745156\n\nSpectral and photometrical observations are required .\n\nThe discovery and reference images are available at:\n\nhttp://master.sai.msu.ru/static/OT/090021.21635049.7.png",
  "circularId": 20381,
  "createdOn": 1483715004000,
  "email": "lipunov2007@gmail.com",
  "subject": "LIGO/Virgo G268556/GW170104: Global MASTER Net observations and first OT detection",
  "submitter": "Vladimir Lipunov at Moscow State U/Krylov Obs  <lipunov2007@gmail.com>",
  "eventId": "LIGO/Virgo G268556"
}