GCN Circular 26973

V. Lipunov, O.Gress, E. Gorbovskoy, N.Tiurina, V.Kornilov, P.Balanutsa,A.Kuznetsov,
V. Vladimirov, D. Vlasenko, F.Balakin, I.Gorbunov, D.Zimnukhov, V.Senik, T.Pogrosheva,
D. Kuvshinov, V.Shumkov (Lomonosov Moscow State University, SAI, Physics Department),
D. Buckley(South African Astronomical Observatory),
R. Rebolo, M. Serra(The Instituto de Astrofisica de Canarias),
A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory),
R. Podesta, C.Lopez, F. Podesta, C.Francile(Observatorio Astronomico Felix Aguilar OAFA),
H. Levato(Instituto de Ciencias Astronomicas, de la Tierra y del Espacio ICATE),
O.A. Gres, N.M. Budnev, O.Ershova (Irkutsk State University, API),
V. Yurkov, A. Gabovich, Yu. Sergienko(Blagoveschensk Educational State University)

MASTER Global Robotic Net (http://observ.pereplet.ru, Lipunov et al., 2010,Advances in Astronomy,v. 2010, 30L)
observed IceCube-HAWC 200202A (error-bx AMON GCN 26963
Not found
 
 
)  since 2020-02-02 
21:50:53 UT.o

MASTER-Amur robotic telescope  (Global MASTER-Net: 
http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, 
vol. 2010, 30L)  located in Russia (Blagoveshchensk State Pedagogical 
University) was pointed to the IceCube Alert 200202.33 (trigger No 
20200202075852,13h 21m 12.00s , +12d 42m 36.0s, R=0.3) errorbox  49921 sec 
after trigger time at 2020-02-02 21:50:53 UT, with upper limit up to  17.2 
mag. Observations started at twilight.  The observations began at zenith 
distance = 44 deg. The sun  altitude  is -11.8 deg.

MASTER-Tunka robotic telescope  located in Russia (Applied Physics 
Institute, Irkutsk State University) was pointed to the IceCube Alert 
200202.33 errorbox  50850 sec after trigger time at 2020-02-02 22:06:22 
UT, with upper limit up to  18.2 mag.
The observations began at zenith distance = 39 deg., sun altitude  was -24.6 deg.

MASTER-SAAO robotic telescope  located in South Africa (South African 
Astronomical Observatory) was pointed to the IceCube Alert 200202.33 
errorbox  53716 sec after trigger time at 2020-02-02 22:54:08 UT, with 
upper limit up to  20.4 mag.
The observations began at zenith distance = 76 deg., sun altitude  was -41.2 deg.

MASTER-IAC robotic telescope  located in Spain (IAC Teide Observatory) was 
pointed to the IceCube Alert 200202.33 errorbox  59842 sec after trigger 
time at 2020-02-03 00:36:14 UT, with upper limit up to  21.5 mag.
The observations began at zenith distance = 69 deg.,sun altitude was -75.5 deg.
The error-box galactic latitude b = 73 deg., longitude l = 332 deg.

Auto-detection system marginally found 
possible OT in SDSS J132141.10+125747.3 with m  ~ 19.6 
(host galaxy photom.z~0.47749).
But hand analysis do not strong supply this 
resuts.

There is QSO SDSS_J13210+1237 in error-box,
but it didn't change the brightness

Reduction and analysys of galaxy clusters inside error-box will be continued.