[vsnet-grb-info 20874] GRB 180718A: MASTER optical observation

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  22972
SUBJECT: GRB 180718A: MASTER optical observation 
DATE:    18/07/20 13:00:27 GMT
FROM:    Vladimir Lipunov at Moscow State U/Krylov Obs  <lipunov at xray.sai.msu.ru>

D. Vlasenko, N.Tiurina,  E. Gorbovskoy, V. Lipunov, V.Kornilov, 
A.Kuznetsov, V.Chazov, I.  Gorbunov, 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 Global Robotic Net  ( Lipunov et al., 2010, Advances in Astronomy, 
vol. 2010, 30L) inspected  GRB180718A  (Svinkin et al. GCN22959 ;
Fermi trigger 553571869  at 2018-07-18 01:57:44.60 UT , Hamburg  et al. 
GCN22960; Swift BAT position RA,Dec2000= 22h 24m 04.6s +02d 47' 23.3" 
(Svinkin et  al GCN22959; Evans et al. GCN22963)

MASTER-Kislovodsk robotic telescope (MASTER-Net: 
http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, 
vol. 2010, 30L) located in Russia (Pulkovo Solar Station) was pointed to 
the GRB180718A (D. Svinkin et al., GCN Circ #22959) 60867 sec after 
trigger time at 2018-07-18 18:52:12 UT . On our first (180s exposure)  set 
we  do not found  optical transients within Swift error-box (ra=336.019 
dec=2.790 r=0.05)  brighter then 18.5.

The observations made on zenit distance = 13.51 degrees, galaxy latitude b 
= -43.86 degree.
The moon (39 % bright part) is 15 degrees above the horizon. The distance 
between  moon and  object is 142
The sun  altitude  is -17.5 degree.
The errorbox observed 2 nights till 2018-07-19 22:23:00

MASTER-Tavrida robotic telescope (MASTER-Net: http://observ.pereplet.ru, 
Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in 
Russia (SAI Crimea astronomical station) was pointed to the GRB180718A (D. 
Svinkin et al., GCN Circ #22959) 63704 sec after trigger time at 
2018-07-18 19:39:29 UT . On our first (180s exposure)  set we  do not 
found  optical transients within Swift error-box (ra=336.019 dec=2.790 
r=0.05)  brighter then 18.6.

The observations made on zenit distance = 15.68 degrees, galaxy latitude b 
= -43.86 degree.
The moon (39 % bright part) is 13 degrees above the horizon. The distance 
between  moon and  object is 142
The sun  altitude  is -18 degree.
The errorbox observed 2 nights till 2018-07-19 21:25:48

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 GRB180718A (D. Svinkin et 
al., GCN Circ #22959) 161995 sec after trigger time at 2018-07-19 22:57:40 
UT . On our first (180s exposure)  set we  do not found  optical 
transients within Swift error-box (ra=336.019 dec=2.790 r=0.05)  brighter 
then 17.5.

The observations made on zenit distance = 18.52 degrees, galaxy latitude b 
= -43.86 degree.
The moon (39 % bright part) is 25 degrees above the horizon. The distance 
between  moon and  object is 128
The sun  altitude  is -11.80 degree.
The errorbox observed till 2018-07-19 23:53:58

The visibility GRB error box (coord: 336.019 2.790  error_box: 0.05)
at trigger time at different MASTER sites:

obj:  43.32 sun: -3.21 - Tavrida (Crimea, Russia)
obj:  53.60 sun: -39.34 - IAC, Teide, (Tenerife, Spain)
obj:  53.56 sun: -45.24 - SAAO (Sutherland, SA)
obj:  40.32 sun:  1.49 - Kislovodsk (Russia)
obj:  23.50 sun:  16.36 -  Ural(Kourovka, Russia)
obj:  0.76  sun:  41.53 -  Tunka (near Baykal Lake, Russia)
obj: -14.45 sun:  55.06 -  Amur(Blagoveschensk)
obj:  6.93  sun: -51.86 -   OAFA (Argentina)

The message may be cited.