[vsnet-grb-info 17413] GRB 160104A: MASTER early OT detection

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  18820
SUBJECT: GRB 160104A: MASTER  early OT detection 
DATE:    16/01/04 14:18:39 GMT
FROM:    Vladimir Lipunov at Moscow State U/Krylov Obs  <lipunov at xray.sai.msu.ru>

V.Yurkov, Yu.Sergienko, A.Gabovich, E.Sinyakov
Blagoveschensk Educational State University, Blagoveschensk

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


V. Lipunov, E. Gorbovskoy, N.Tyurina, D. Vlasenko, V.Kornilov, 
P.Balanutsa, A.Kuznetsov, D. Vlasenko
Lomonosov Moscow State University, Sternberg Astronomical Institute

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


report on behalf of the MASTER Team:

MASTER-Amur  robotic telescope (MASTER-Net: http://observ.pereplet.ru) 
located in Blagoveschensk was pointed to the  GRB160104A (Melandri et 
al., GCN 18815) 10 sec after notice time and 32 sec after trigger time
at 2016-01-04 11:24:46 UT. On our first (10s exposure)  set we have
found optical transient  with 17.0+/-0.3 unfiltered magnitude at LCOGT-FTN 
and 
MITSuME Akeno position (Guidorzi et al., GCN 18816; Saito et al., GCN 18817)
The 5-sigma upper limit has been about 17.3 mag

MASTER-Tunka robotic telescope (MASTER-Net: http://observ.pereplet.ru)
located near Bykal lake  was pointed to the  GRB160104A 66 sec after 
trigger time at 2016-01-04 11:25:20 UT. On our first (10s exposure)  set 
we have found marginally optical transient  ~17 unfiltered magnitude.
The 5-sigma upper limit has been about 17.2mag

The reduction is continuated.
The message may be cited.