[vsnet-grb-info 20788] GRB 180704A: MASTER optical observation

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  22886
SUBJECT: GRB 180704A: MASTER optical observation
DATE:    18/07/04 06:33:15 GMT
FROM:    Vladimir Lipunov at Moscow State U/Krylov Obs  <lipunov at xray.sai.msu.ru>

V. Lipunov, E. Gorbovskoy, 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

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)

D. Buckley
South African Astronomical Observatory

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

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



MASTER-IAC robotic telescope (MASTER-Net: http://observ.pereplet.ru, 
Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in 
Spain (IAC Teide Observatory) was pointed to the Swift BAT GRB180704A 
(Sonbas et al. GCN 22885) 25 sec  after notice time and 41 sec after 
trigger time at 2018-07-04 05:37:23 UT. 
On our 10,20s exposure  set there is no optical transient  within SWIFT 
error-box (ra=32.6375 dec=69.9478 r=0.05).
The 5-sigma upper limit has been about 14.2mag
The message may be cited.


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



The observations made on zenit distance = 48 degrees, galaxy latitude b = 
8 degree.
The moon (70 % bright part) is 54 degrees above the horizon. The distance 
between  moon and  object is 83
Observations started at twilight.
The sun  altitude  is -7.5 degree, sunrise.