TITLE: GCN CIRCULAR NUMBER: 23008 SUBJECT: ANTARES neutrino Alert180713.02: MASTER optical observation DATE: 18/07/22 08:48:26 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs V.Lipunov, N.Tiurina, E. Gorbovskoy, V. Lipunov, V.Kornilov, A.Kuznetsov, V.Chazov, I. Gorbunov, D.Zimnukhov, D.Kuvshinov, P.Balanutsa, V.Vladimirov, D.Vlasenko Lomonosov Moscow State University,SAI D. Buckley, South African Astronomical Observatory (SAAO) R. Rebolo, M. Serra, N. Lodieu, G. Israelian, L. Suarez-Andres The Instituto de Astrofisica de Canarias (IAC) A. Tlatov, V.Senik, D. Dormidontov Kislovodsk Solar Station of the Pulkovo Observatory R. Podesta, F. Podesta, C. Lopez, C.Francile Observatorio Astronomico Felix Aguilar (OAFA) H.Levato, Instituto de Ciencias Astronomicas, de la Tierra y del Espacio (ICATE) O. Gres, N.M.Budnev , Yu.Ishmuhametova Irkutsk State University (ISU) A. Gabovich, V. Yurkov, Yu. Sergienko Blagoveschensk Educational State University (BSPU) MASTER II robotic telescope (MASTER-Net: http://observ.pereplet.ru) located in SAAO was starting survey on the Antares neutrino Alert180713.02 error-box (ra=07 53 16 dec=-44 19 01 r=1.8312) 7 days 15734 sec after notice time and 7 days 15755 sec after trigger time at 2018-07-21 16:44:30 UT. The 5-sigma upper limit on our second (180s exposure) set is about 17.2 mag The OT candidate available here https://196.21.94.34//master2/trans.php?wh=transients.coord2000@%27%3C%28118.317d%2C-44.3169d%29%2C3.6624d%3E%27%3A%3Ascircle+and+transients.datetime%3E%3D%272018-07-13+00%3A27%3A09.99%27&class=9&t2=Antares++neutrino+Alert180713.02+optical+counterpart+candidate The full information about this neutrino Alert180713.02 available here https://196.21.94.34//master2/grb.php?not=2018-07-13+00%3A27%3A30.841519&sat=Antares&gcrd=%28118.317d%2C-44.3169d%29&eb=1.8312&trig=2018-07-13+00%3A27%3A09.99&n= neutrino Alert180713.02 The observations made on zenit distance = 70 degrees, galaxy latitude b = -8 degree. The moon (69 % bright part) is 64 degrees above the horizon. The distance between moon and object is 96 Observations started at twilight. The sun altitude is -11.3 degree. The object can be observed till sunrise at 2018-07-22 05:31:45. The message may be cited.