{
  "bibcode": "2019GCN.24133....1L",
  "body": "V. Lipunov, E. Gorbovskoy, N.Tyurina, V.Kornilov, D.Vlasenko, V.Vladimirov, D.Zimnukhov,\nA.Kuznetsov, P.Balanutsa, A. Chasovnikov, V.Topolev, D.Kuvshinov, F.Balakin (Lomonosov Moscow State University, SAI, Physics Department),\n\nR. Rebolo, M. Serra, N. Lodieu, G. Israelian, L. Suarez-Andres (The Instituto de Astrofisica de Canarias),\n\nD. Buckley (South African Astronomical Observatory),\n\nO. Gress, N.M. Budnev, O.Ershova (Applied Physics Institute, Irkutsk State University),\n\nV. Yurkov, A. Gabovich, Yu. Sergienko, D. Kobcev (Blagoveschensk Educational State University),\n\n\nA. Tlatov, V.Senik, A.V. Parhomenko, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory),\n\nR. Podesta, C. Lopez, C.Francile, F. Podesta (Observatorio Astronomico Felix Aguilar OAFA, San Juan National University),\n\nH.Levato (Instituto de Ciencias Astronomicas, de la Tierra y del Espacio ICATE SJNU)\n\nMASTER Global Robotic Net (http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, v. 2010, 30L)\nautomatically started inspection of  Fermi trigger 576241792 https://gcn.gsfc.nasa.gov/other/576241792.fermi\n7843s after trigger time at 2019-04-06  13:20:30 UT\n\nMASTER Net cover map is available at http://observ.pereplet.ru/images/MASTER_FermiTrig576241792covermap.jpg\n\nMASTER-Tunka robotic telescope located in Russia (Applied Physics Institute, Irkutsk State University)\nwas pointed to the  FERMI GRB190406.47 ( 19h  5m 21.60s , +61d 30m 00.00s, R=7.09)\n7843 sec after trigger time at 2019-04-06 13:20:30 UT, with upper limit up to  19.8 mag.\nObservations started at twilight.  The observations began at zenit distance = 65 deg. The sun  altitude  is -14.6 deg.\n\nMASTER-Kislovodsk robotic telescope  located in Russia (Lomonosov MSU, Kislovodsk Solar Station of Pulkovo observatory)\nstarted FERMI GRB190406.47 / trigger 576241792 inspection  20777 sec after trigger time at 2019-04-06 16:56:04 UT, \nwith upper limit up to  19.9 mag. Observations started at twilight.\n  The observations began at zenit distance = 74 deg. The sun  altitude  is -13.8 deg.\n\nMASTER-Tavrida robotic telescope  located in Russia (Lomonosov MSU, SAI Crimea astronomical station)\nstarted FERMI GRB190406.47 inspection 26157 sec after trigger time at 2019-04-06 18:25:44 UT, with upper limit up to  19.5 mag.\nThe observations began at zenit distance = 70 deg. The sun  altitude  is -22.5 deg.\n\nMASTER-IAC robotic telescope  located in Spain (IAC Teide Observatory) started\n  FERMI GRB190406.47 inspection 39426 sec after trigger time at 2019-04-06 22:06:53 UT, with upper limit up to  20.1 mag.\nThe observations began at zenit distance = 84 deg. The sun  altitude  is -34.8 deg.\n\nThe galactic latitude b = -60 deg., longitude l = 98 deg.\n\n\nMASTER auto-detection system didn't find OT connected with GRB.\n\nDuring inspection we find OT\n\nMASTER OT J193011.47+465928.3 detection - preliminary dwarf nova outburst, ampl>4.3m\n\nMASTER-Kislovodsk auto-detection system (Lipunov et al., 2010, Advances in Astronomy, v. 2010, 30L)\ndiscovered OT source at (RA, Dec) = 19h 30m 11.47s +46d 59m 28.3s on 2019-04-07.95397 UT.\nThe OT unfiltered magnitude is 15.4m (limit 19.0m).\n\nThe OT is seen in 8 images. There is no minor planet at this place.\n\nWe have reference image without OT on 2019-02-13.08602 UT with unfiltered \nmagnitude limit 19.6m, on 2016-07-29 21:12:44 with mlim=19.7, it means \nmore then 4.3m of current outburst amplitude (there is USNO-B1 star in 0.3\" with B1=19.5,R2=19.3).\n\nSpectral observations are required.\n\nThe discovery and reference images are available at:\nhttp://master.sai.msu.ru/static/OT/193011.47465928.3.png\n\nWe checked coordinates of 4 ZTF candidates (Ahumada et al. GCN24130) in \nMASTER database  and didn't find OT at position of 3 ones since 2009y (up to unfiltered 20.0)\n\nAbout ZTF19aapfxqv\nMASTER has seen an object at the position \n18h 27m 39.96s , +65d 37m 33.70s (MASTER OT J182739.96+653733.70) \non 2017-12-07 21:15:28.334UT with m_OT=18.3+-0.2 (and we should note there \nis PanSTARRs source in 5.7\").\n\nThis message may be cited",
  "circularId": 24133,
  "createdOn": 1555695029000,
  "email": "lipunov@xray.sai.msu.ru",
  "subject": "Fermi trigger 576241792 / GRB 190406B: MASTER optical observation",
  "submitter": "Vladimir Lipunov at Moscow State U/Krylov Obs  <lipunov@xray.sai.msu.ru>",
  "eventId": "GRB 190406B"
}