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GCN Circular 23610

Subject
IceCube-190104A: MASTER optical observation
Date
2019-01-05T12:27:05Z (5 years ago)
From
Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>
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.
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