TITLE: GCN CIRCULAR NUMBER: 19362 SUBJECT: MASTER search for counterpart to the IceCube event 67093193 (run 127853) DATE: 16/04/29 15:55:09 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs V. Lipunov, E.Gorbovskoy, V.Kornilov, D.Kuvshinov, N.Tyurina, P.Balanutsa, A.Kuznetsov, V.V.Chazov Lomonosov Moscow State University,Sternberg Astronomical Institute V.Yurkov, Yu.Sergienko, A.Gabovich Blagoveschensk Educational State University, Blagoveschensk R. Rebolo, M. Serra Ricart, N. Lodieu, G. Israelian The Instituto de Astrofisica de Canarias N.M.Budnev, K.Ivanov, S.Yazev, O.Gres, O.Chuvalaev, V.A.Poleshchuk Irkutsk State University D.Buckley, S. Potter, M.Kotze, A.Kniazev South African Astronomical Observatory MASTER received AMON ICECUBE HESE alert (http://gcn.gsfc.nasa.gov/notices_amon/67093193_127853.amon, DISCOVERY_TIME: 16/04/27 05:52:32.00 UT) at 27 Apr 16 05:53:53 UT . MASTER-IAC pointed to 15h 58m 39s +06d 51' 10 155 sec after trigger time and 74 sec after notice time. But the Sun Altitude was -8.27, i.e.the beginning of sunrise. But 4 hours befor MASTER-IAC made a survey in this area --------------------------------------------------------------------- The centers of obs.area(2x2d) The time_start,UT Exp. m_lim Tube 15h 57m 30.7s +08d 02m 48s Survey 2016-04-27 01:51:16 60 19.3W WEST 15h 57m 29.1s +08d 03m 10s Survey 2016-04-27 01:40:42 60 19.3W WEST 15h 57m 30.3s +08d 02m 47s Survey 2016-04-27 01:30:29 60 19.3W WEST --------------------------------------------------------------------- 2) The second message of alert was at 27 Apr 16 15:51:18 UT MASTER-Amur pointed 283 sec on 2016-04-27 15:56:01UT (60s exp., 17.0 P on the first image, 17.7 on the summ images 540s) 3) MASTER-IAC started observations of the corrected alert coordinates 16h 02m 16s +09d 20' 30" on 2016-04-27 23:25:11UT 47 sec after notice time with m_lim=19.3 on the single images, 19.8 on the summ. There is no OT inside 36 arcmin radius(the error box). 4) MASTER-SAAO started observations on the 2016-04-28 02:43:11 UT with m_lim=19.6 . There is no OT inside the error box. The message may be cited.