[vsnet-grb-info 18746] GRB 161117A: MASTER-OAFA (Argentina) prompt OT observations

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  20195
SUBJECT: GRB 161117A: MASTER-OAFA (Argentina) prompt OT observations
DATE:    16/11/18 12:54:01 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
Lomonosov Moscow State University, Sternberg Astronomical Institut of MSU

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

V.Yurkov, Yu.Sergienko, D.Varda, E.Sinyakov
Blagoveschensk Educational State University, Blagoveschensk

A. Tlatov, A.V. Parhomenko, D. Dormidontov, V.Senik
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-OAFA  robotic telescope (MASTER-Net: http://observ.pereplet.ru) 
located in OAFA was pointed to the  GRB161117A 22 sec after notice time 
and 31 sec after trigger time at 2016-11-17 01:36:13 UT. On our first (10s 
exposure)  set we  found optical transient  within SWIFT error box 
(Cummings et al., 20179) at the Swift UVOT position (Cummings et al., 
20179; Daniele Malesani et al. GCN 20180;).
The OT magnitude ~17.0 .
The 5-sigma upper limit has been about 17.5 mag

After several minutes OT disapear and apear against around 01 35 56 UT
  with unfiltered (red) magnirude ~ 18.0 
(cf  D'Avanzo et al., GCN 20181;).

The observations started at
zenit distance = 42 degrees,
galaxy latitude b = -46 degree.
The moon (91 % bright part) below the horizon (The altitude of 
the Moon is -1 degree ).
The sun  altitude  is -25.6 degree.
The object can be observed till 2016-11-17 05:44:35 UT.

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