TITLE: GCN CIRCULAR NUMBER: 23610 SUBJECT: IceCube-190104A: MASTER optical observation DATE: 19/01/05 12:27:05 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs O.Gress, V. Lipunov, V.Senik, E. Gorbovskoy, V.Kornilov, N.Tiurina, V.Vladimirov, P.Balanutsa, A.Kuznetsov, D. Vlasenko, D.Kobtsev (Lomonosov Moscow State University, SAI), D. Buckley (South African Astronomical Observatory), R. Podesta, C.Lopez, F. Podesta, C.Francile (Observatorio Astronomico Felix Aguilar), H. Levato (Instituto de Ciencias Astronomicas, de la Tierra y del Espacio of San Juan National University, Argentina) R. Rebolo, M. Serra, N. Lodieu, G. Israelian, L. Suarez-Andres (The Instituto de Astrofisica de Canarias), A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory), N.M. Budnev, S. Yazev, O. Chuvalaev (Irkutsk State University, API) A. Gabovich, V.Yurkov, D.Kobtsev, Yu. Sergienko (Blagoveschensk Educational State University) MASTER-SAAO robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in South African Astronomical Observatory, automatically started inspect of the ICECUBE Alert190104.36 error-box (23 57 19 dec=-25 21 57, r=1.23 taken from the IceCube-MASTER socket ) 36615 sec after notice time and 36655sec after trigger time at 2019-01-04 18:45:33 UT. The 5-sigma upper limit on our first (180s exposure) set is 18.4 mag IceCube publishied error-box differs from socket one (Kopper et al. GCN 23605) MASTER cover map will be available here http://master.sai.msu.ru/static/IC/MASTERIC190104.36.png There are the following sources in IceCube error box: 1) 4 blazars from Roma BZCAT 5BZBJ2350-2436 357.59720 -24.60083 0.193 16.2 , dist= 2.085 deg 5BZQJ2352-2825 358.22070 -28.43111 1.662 19.1 , dist= 1.797 deg 5BZQJ2353-2743 358.29776 -27.72378 0.889 17.9 , dist= 1.120 deg 5BZQJ2357-2451 359.34937 -24.85089 1.614 19.3 , dist= 2.261 deg 2) 3 known supernovae : LSQ12gdj, SN1993ah, PTF11klo 3) 62 xray sources 4) 75 radio-sources 5) 3297 galaxies inside 2.28 deg radii 6) 2 variable sources from AAVSO database VZ Scl 23 50 09.25 -26 22 52.6 (type : NL/VY+E) ATLAS18tyo 23 52 08.06 -27 48 07.7 (type : UG) MASTER Global Robotic Net continues inspection. ==================================================================== The error-box center's galactic latitude b = -78 deg., longitude l = 40 deg. The observations started at zenit distance = 41 deg. The moon ( 2 % bright part)was below the horizon ( The altitude of the Moon was -22 deg ( 2 % bright part) Observations started at twilight, the sun altitude was -11.4 deg.