TITLE:   GCN CIRCULAR
NUMBER:  22926
SUBJECT: GRB 180703A: MASTER optical observation 
DATE:    18/07/07 15:21:34 GMT
FROM:    Vladimir Lipunov at Moscow State U/Krylov Obs  <lipunov@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

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-SAAO robotic telescope (MASTER-Net: http://observ.pereplet.ru, 
Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in 
South Africa (South African Astronomical Observatory) was pointed to the 
GRB180703A (Poolakkil et al., GCN Circ #22896) 17 sec after notice time 
and 576 sec after trigger time at 
2018-07-03 21:11:17 UT. On our first (120s exposure)  set we not  found
optical transient within FERMI error-box (ra=349.946 dec=-65.5794 r=1.62) 
brighter then 18.0.

MASTER-SAAO robotic telescope (MASTER-Net: http://observ.pereplet.ru, 
Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in 
South Africa (South African Astronomical Observatory) was pointed to the 
GRB180703A (Racusin et al., GCN Circ #22883) 14961 sec after trigger time 
at  2018-07-04 01:11:02 UT . On our first (180s exposure)  set we  do not 
found  optical transients within LAT error-box (ra=6.54 dec=-67.09 
r=0.3)  brighter then 18.3.

The observations made on zenit distance = 44 degrees, galaxy latitude b = 
-50 degree.
The moon (72 % bright part) is 55 degrees above the horizon. The distance 
between  moon and  object is 60
The sun  altitude  is -55.4 degree.
The object can be observed till sunrise at 2018-07-04 05:38:26

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  GRB180703A 14975 sec after trigger 
time at 2018-07-04 01:11:15 UT. On our first (180s exposure)  set we 
found 6 optical transient within LAT error-box (ra=6.5375 dec=-67.0894 
r=0.3039) brighter then 14.7.


The observations made on zenit distance = 76 degrees, galaxy latitude b = 
-50 degree.
The moon (72 % bright part) below the horizon (The altitude of the Moon is 
-18 degree ).
The sun  altitude  is -43.1 degree.
The object can be observed till sunrise at 2018-07-04 11:36:37


The visibility GRB error box (coord: 349.9500 -65.5800 error_box: 0.3) 
at trigger time at different MASTER sites:


obj: -42.33 sun: -21.55 - Tavrida (Crimea, Russia) 
obj: -41.44 sun: -11.38 - IAC, Teide, (Tenerife, Spain)
obj:  28.43 sun: -66.35 - SAAO (Sutherland, SA) 
obj: -31.89 sun: -23.27 - Kislovodsk (Russia)
obj: -38.98 sun: -9.15 -  Ural(Kourovka, Russia)
obj: -27.62 sun:  0.11 -  Tunka (near Baykal Lake, Russia) 
obj: -26.46 sun: 12.65 -  Amur(Blagoveschensk)
obj:  7.39 sun:  7.00 -   OAFA (Argentina)

The message may be cited.