GCN Circular 23490

V. Lipunov, E. Gorbovskoy, V.Kornilov, D.Kuvshinov, N.Tyurina, P.Balanutsa,
A.Kuznetsov, V.V.Chazov, D. Vlasenko
Lomonosov Moscow State University,
Sternberg Astronomical Institute, Moscow State University

A. Tlatov, V.Senik, A.V. Parhomenko, D. Dormidontov
Kislovodsk Solar Station of the Pulkovo Observatory

K. Ivanov, O. Gres, N.M. Budnev, S. Yazev, O. Chuvalaev, V. Poleshchuk
Irkutsk State University

V. Yurkov, A. Gabovich, Yu. Sergienko
Blagoveschensk Educational State University, Blagoveschensk

R. Podesta, Carlos Lopez and F. Podesta
Observatorio Astronomico Felix Aguilar (OAFA)

Hugo Levato and Carlos Saffe
Instituto de Ciencias Astronomicas, de la Tierra y del Espacio (ICATE)

R. Rebolo, M. Serra, N. Lodieu, G. Israelian, L. Suarez-Andres
The Instituto de Astrofisica de Canarias

D. Buckley, S. Potter, A. Kniazev, M. Kotze
South African Astronomical Observatory



MASTER-Tunka robotic telescope (MASTER-Net: http://observ.pereplet.ru, 
Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in 
Russia (Applied Physics Institute, Irkutsk State University) was pointed 
to the  Swift GRB 181202A (Cannizzo et al., GCN  #23482) 13216 sec after 
trigger time at 2018-12-02 10:17:08. On best sum (1800s total
exposure)  set 
we haven`t found optical transient  within Swift error-box (ra=280.733 
dec=27.9592 r=0.05).

The 5-sigma upper limit has been about 19.0 mag


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The galactic latitude b = 14 deg., longitude l = 58 deg.
The observations made on zenit distance = 42 deg.The moon (25 % bright 
part) below the horizon (The altitude of the Moon is -26 deg. ).
  Observations started at twilight.
The sun  altitude  is -10.6 deg.
The object can be observed till sunrise at 2018-12-02 00:56:06

MASTER-Kislovodsk robotic telescope  located in Russia (Lomonosov MSU, 
Kislovodsk Solar Station of Pulkovo observatory) was pointed to the  SWIFT 
GRB181202.28 32902 sec after trigger time at 2018-12-02 15:46:09 UT, with 
upper limit up to  20.2 mag. No OT detected.

The observations began at zenit distance = 57 
deg. The sun  altitude  is -23.0 deg.


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