[vsnet-grb-info 19189] GRB 170311A: MASTER-OAFA early optical observations

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  20847
SUBJECT: GRB 170311A: MASTER-OAFA  early  optical observations
DATE:    17/03/11 10:01:06 GMT
FROM:    Vladimir Lipunov at Moscow State U/Krylov Obs  <lipunov at xray.sai.msu.ru>

R.Podesta, C.Lopez, F. Podesta Observatorio Astronomico Felix Aguilar (OAFA) , 
National University of San Juan, Argentina

H. Levato, C. Saffe
Instituto de Ciencias Astronomicas,de la Tierra y del Espacio (ICATE),
San Juan, Argentina

V. Lipunov, E. Gorbovskoy, V.Kornilov, D.Kuvshinov, N.Tyurina, A.V.Krylov, 
I.Gorbunov, P.Balanutsa, A.Kuznetsov, V.V.Chazov, D. Vlasenko

Lomonosov Moscow State 
University, Sternberg Astronomical Institut of MSU

K.Ivanov, S.Yazev, N.M.Budnev, O.Gres, O.Chuvalaev, V.A.Poleshchuk, O. 
Ershova Irkutsk State University

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

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

D.Buckley, S. Potter, A.Kniazev, M.Kotze
South African Astronomical Observatory

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

MASTER II  robotic telescope (MASTER-Net: http://observ.pereplet.ru) 
located in OAFA was pointed to the  GRB170311A 18 sec after notice time 
and 59 sec after trigger time (Cummings et al.,  GCN 20846)
at 2017-03-11 08:09:45 UT. On our first (10s 
exposure)  set we haven`t found optical transient  within SWIFT error-box 
(ra=280.562 dec=-30.0628 r=0.05).
The 5-sigma upper limit has been about 16.2 mag

The observations made on zenit distance = 49 degrees, galaxy latitude b = 
-12 degree.
The moon (98 % bright part) is 15 degrees above the horizon. The distance 
between  moon and  object is 124
The sun  altitude  is -30.1 degree.
The object can be observed till sunrise at 2017-03-11 10:34:12

  The message may be cited.