[vsnet-grb-info 20873] GRB 180718B: MASTER optical observation

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  22971
SUBJECT: GRB 180718B: MASTER optical observation 
DATE:    18/07/20 12:48:11 GMT
FROM:    Vladimir Lipunov at Moscow State U/Krylov Obs  <lipunov at xray.sai.msu.ru>

E. Gorbovskoy, V. Lipunov, V.Kornilov,  N.Tiurina, 
A.Kuznetsov, V.Chazov, I. Gorbunov, D. Vlasenko, D.Zimnukhov, D.Kuvshinov, 
P.Balanutsa, V.Vladimirov
Lomonosov Moscow State University,SAI

D. Buckley,
South African Astronomical Observatory (SAAO)

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

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

R. Podesta, F. Podesta, C. Lopez, C.Francile
Observatorio Astronomico Felix Aguilar (OAFA)

H.Levato,
Instituto de Ciencias Astronomicas, de la Tierra y del Espacio (ICATE)

O. Gres, N.M.Budnev , Yu.Ishmuhametova
Irkutsk State University (ISU)

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


MASTER-OAFA robotic telescope (MASTER-Net: http://observ.pereplet.ru, 
Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in 
Argentina (OAFA observatory of San Juan National University) was pointed 
to the  GRB180718.76 36087 sec after notice time and 36087 sec after 
trigger time at 2018-07-19 04:19:52 UT. On our combined images (1800 s), 
started 41401 sec after tigger time at 2018-07-19 05:48:25 UT, we 
not found  optical transient within LAT error-box (ra=44.6792 dec=-31.5 
r=1)  brighter then 20.4.


The observations made on zenit distance = 74 degrees, galaxy latitude b = 
-62 degree. The moon (44 % bright part) below the horizon (The altitude of 
the Moon is  -20 degree ).
The sun  altitude  is -71.7 degree.
The object can be observed till sunrise at 2018-07-19 11:33:26 .

The message may be cited.