GCN Circular 23333

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-Kislovodsk robotic telescope (MASTER-Net: 
http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, 
vol. 2010, 30L) located in Russia (Lomonosov MSU, Kislovodsk Solar Station 
of Pulkovo observatory) was pointed to the  GRB181013A (D'Avanzo et al., 
GCN 23332
Not found
 
 
) 21 sec after notice time and 54 sec after trigger time
at 2018-10-13 02:40:23 UT . On 
our first (10s exposure)  set we haven`t found optical transient  within 
SWIFT error-box (ra=207.596 dec=40.1783 r=0.05).
The 5-sigma upper limit has been about 13.2 mag
The message may be cited.


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The galactic latitude b = 72 deg., longitude l = 82 deg.
The observations made on zenit distance = 71 deg.The moon (18 % bright 
part) below the horizon (The altitude of the Moon is -50 deg. ).
Observations started at twilight.
The sun  altitude  is -7.8 deg.
The object can be observed till sunrise at 2018-10-13 03:20:48.


MASTER-Tavrida robotic telescope (MASTER-Net: http://observ.pereplet.ru, 
Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in 
Russia (Lomonosov MSU, SAI Crimea astronomical station) was pointed to the 
GRB181013.11 129 sec after notice time and 202 sec after trigger time at 
2018-10-13 02:42:51 UT. On our first (40s exposure)  set we haven`t found 
optical transient  within SWIFT error-box (ra=207.596 dec=40.1781 r=0.1).
The 5-sigma upper limit has been about 17.4 mag
The message may be cited.


====================================================================


The galactic latitude b = 72 deg., longitude l = 82 deg.
The observations made on zenit distance = 75 deg.The moon (18 % bright 
part) below the horizon (The altitude of the Moon is -54 deg. ).
Observations started at twilight.
The sun  altitude  is -13.6 deg.
The object can be observed till sunrise at 2018-10-13 03:56:18.



This message can be cited.