{
  "bibcode": "2018GCN.22972....1V",
  "body": "D. Vlasenko, N.Tiurina,  E. Gorbovskoy, V. Lipunov, V.Kornilov, \nA.Kuznetsov, V.Chazov, I.  Gorbunov, D.Zimnukhov, D.Kuvshinov, \nP.Balanutsa, V.Vladimirov\nLomonosov Moscow State University,SAI\n\nD. Buckley,\nSouth African Astronomical Observatory (SAAO)\n\nR. Rebolo, M. Serra, N. Lodieu, G. Israelian, L. Suarez-Andres\nThe Instituto de Astrofisica de Canarias (IAC)\n\nA. Tlatov, V.Senik, D. Dormidontov\nKislovodsk Solar Station of the Pulkovo Observatory\n\nR. Podesta, F. Podesta, C. Lopez, C.Francile\nObservatorio Astronomico Felix Aguilar (OAFA)\n\nH.Levato,\nInstituto de Ciencias Astronomicas, de la Tierra y del Espacio (ICATE)\n\nO. Gres, N.M.Budnev , Yu.Ishmuhametova\nIrkutsk State University (ISU)\n\nA. Gabovich, V. Yurkov, Yu. Sergienko\nBlagoveschensk Educational State University (BSPU)\n\n\n\nMASTER Global Robotic Net  ( Lipunov et al., 2010, Advances in Astronomy, \nvol. 2010, 30L) inspected  GRB180718A  (Svinkin et al. GCN22959 ;\nFermi trigger 553571869  at 2018-07-18 01:57:44.60 UT , Hamburg  et al. \nGCN22960; Swift BAT position RA,Dec2000= 22h 24m 04.6s +02d 47' 23.3\" \n(Svinkin et  al GCN22959; Evans et al. GCN22963)\n\nMASTER-Kislovodsk robotic telescope (MASTER-Net: \nhttp://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, \nvol. 2010, 30L) located in Russia (Pulkovo Solar Station) was pointed to \nthe GRB180718A (D. Svinkin et al., GCN Circ #22959) 60867 sec after \ntrigger time at 2018-07-18 18:52:12 UT . On our first (180s exposure)  set \nwe  do not found  optical transients within Swift error-box (ra=336.019 \ndec=2.790 r=0.05)  brighter then 18.5.\n\nThe observations made on zenit distance = 13.51 degrees, galaxy latitude b \n= -43.86 degree.\nThe moon (39 % bright part) is 15 degrees above the horizon. The distance \nbetween  moon and  object is 142\nThe sun  altitude  is -17.5 degree.\nThe errorbox observed 2 nights till 2018-07-19 22:23:00\n\nMASTER-Tavrida robotic telescope (MASTER-Net: http://observ.pereplet.ru, \nLipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in \nRussia (SAI Crimea astronomical station) was pointed to the GRB180718A (D. \nSvinkin et al., GCN Circ #22959) 63704 sec after trigger time at \n2018-07-18 19:39:29 UT . On our first (180s exposure)  set we  do not \nfound  optical transients within Swift error-box (ra=336.019 dec=2.790 \nr=0.05)  brighter then 18.6.\n\nThe observations made on zenit distance = 15.68 degrees, galaxy latitude b \n= -43.86 degree.\nThe moon (39 % bright part) is 13 degrees above the horizon. The distance \nbetween  moon and  object is 142\nThe sun  altitude  is -18 degree.\nThe errorbox observed 2 nights till 2018-07-19 21:25:48\n\nMASTER-IAC robotic telescope (MASTER-Net: http://observ.pereplet.ru, \nLipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in \nSpain (IAC Teide Observatory) was pointed to the GRB180718A (D. Svinkin et \nal., GCN Circ #22959) 161995 sec after trigger time at 2018-07-19 22:57:40 \nUT . On our first (180s exposure)  set we  do not found  optical \ntransients within Swift error-box (ra=336.019 dec=2.790 r=0.05)  brighter \nthen 17.5.\n\nThe observations made on zenit distance = 18.52 degrees, galaxy latitude b \n= -43.86 degree.\nThe moon (39 % bright part) is 25 degrees above the horizon. The distance \nbetween  moon and  object is 128\nThe sun  altitude  is -11.80 degree.\nThe errorbox observed till 2018-07-19 23:53:58\n\nThe visibility GRB error box (coord: 336.019 2.790  error_box: 0.05)\nat trigger time at different MASTER sites:\n\nobj:  43.32 sun: -3.21 - Tavrida (Crimea, Russia)\nobj:  53.60 sun: -39.34 - IAC, Teide, (Tenerife, Spain)\nobj:  53.56 sun: -45.24 - SAAO (Sutherland, SA)\nobj:  40.32 sun:  1.49 - Kislovodsk (Russia)\nobj:  23.50 sun:  16.36 -  Ural(Kourovka, Russia)\nobj:  0.76  sun:  41.53 -  Tunka (near Baykal Lake, Russia)\nobj: -14.45 sun:  55.06 -  Amur(Blagoveschensk)\nobj:  6.93  sun: -51.86 -   OAFA (Argentina)\n\nThe message may be cited.",
  "circularId": 22972,
  "createdOn": 1532091627000,
  "email": "lipunov@xray.sai.msu.ru",
  "subject": "GRB 180718A: MASTER optical observation",
  "submitter": "Vladimir Lipunov at Moscow State U/Krylov Obs  <lipunov@xray.sai.msu.ru>",
  "eventId": "GRB 180718A"
}