TITLE:   GCN CIRCULAR
NUMBER:  20439
SUBJECT: GRB 170112A: MASTER-OAFA (Argentina) early  optical observations
DATE:    17/01/12 13:50:39 GMT
FROM:    Vladimir Lipunov at Moscow State U/Krylov Obs  <lipunov@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 
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   robotic telescope (MASTER-Net: http://observ.pereplet.ru) 
located in OAFA was pointed to the  GRB170112A 18 sec after notice time 
and 25 sec after trigger time at 2017-01-12 02:02:31 UT. On our first (10s 
exposure)  set we haven`t found optical transient  within SWIFT 
BAT error-box (Mingo et al., GCN 20436).
The 5-sigma upper limit has been about 16.04mag
The message may be cited.

The observations made on zenit distance = 54 degrees, galaxy latitude b = 
-79 degree.
The moon (100 % bright part) is 30 degrees above the horizon. The distance 
between  moon and  object is 97
The sun  altitude  is -23.9 degree.
The object can be observed till 2017-01-12 04:57:47

  The message may be cited.