{
  "bibcode": "2017GCN.21219....1L",
  "body": "V. Lipunov, N.Tyurina, V.Kornilov, E.Gorbovskoy,  A.Kuznetsov, \nV.Vladimirov,  I.Gorbunov, D.Kuvshinov,  A.V.Krylov, P.Balanutsa, V.V.Chazov, D. Vlasenko\nLomonosov Moscow State University, Sternberg Astronomical Institut of MSU\n\nA. Tlatov, V.Senik, A.V. Parhomenko, D. Dormidontov\nKislovodsk Solar Station of the Pulkovo Observatory\n\nN.M.Budnev, O.Gres, O. Ershova\nIrkutsk State University\n\nA.Gabovich, V.Yurkov, Yu.Sergienko\nBlagoveschensk Educational State University, Blagoveschensk\n\nD.Buckley, S. Potter, A.Kniazev, M.Kotze\nSouth African Astronomical Observatory\n\nR. Rebolo, M. Serra, N. Lodieu, G. Israelian, L. Suarez-Andres\nThe Instituto de Astrofisica de Canarias\n\nR.Podesta, C.Lopez, F. Podesta Observatorio Astronomico Felix Aguilar (OAFA),\nNational University of San Juan, Argentina\n\nH. Levato, C. Saffe\nInstituto de Ciencias Astronomicas,de la Tierra y del Espacio (ICATE),\nSan Juan, Argentina\n\nMASTER-Tavrida robotic telescope (MASTER-Net: http://observ.pereplet.ru) \nlocated in Crimea Astronomical station of  Lomonosov Moscow State \nUniversity pointed to the FERMI  GRB 170607A  error-box (ra=00 37 55 \ndec=+07 46 10  r=1.53, see Hamburg and Meegan GCN #21218)  25 sec after \nFermi GBM notice time and 63 sec after  Fermi GBM trigger time at \n2017-06-08 23:19:03 UT. This was 150 sec before Swift trigger (D'Ai et \nal., GCN #21214).\n\nMASTER-Tavrida robotic telescope repointed to Swift BAT error box (D'Ai et\nal., GCN #21214)  25 sec after Swift Notice Time and 42 sec after Swift \ntrigger  at  2017-06-07 23:22:15 UT . We see OT at first image with 10 sec \nexposition.  We have OT light curve starting before maximum (UT_max = ~ \n23h 24m)  up to 2017-06-08 00:40:52 UT:\n\nUT_max = 23:23:45 +/- 10sec\n\nOT unfiltered magnitude (max) = 16.4 +- 0.1\n\nRA,DEC = 00h 29m 27s.8 + 9d 14m 35s.8\nError = 0.5 arcsec\n\nPosition is coincide with UVOT position (D'Ai et al., GCN #21214).\n\nWe see  rebrighting or plato starting at 2017-06-07 23:52:43 UT (~30 min \nafter  Swift  trigger).\n\nThe message may be cited.",
  "circularId": 21219,
  "createdOn": 1496919909000,
  "email": "lipunov@xray.sai.msu.ru",
  "subject": "GRB 170607A: MASTER-Tavrida  early OT observations",
  "submitter": "Vladimir Lipunov at Moscow State U/Krylov Obs  <lipunov@xray.sai.msu.ru>",
  "eventId": "GRB 170607A"
}