TITLE:   GCN CIRCULAR
NUMBER:  19118
SUBJECT: GRB 160228A: MASTER-Amur prompt observations 
DATE:    16/02/29 18:04:58 GMT
FROM:    Vladimir Lipunov at Moscow State U/Krylov Obs  <lipunov@xray.sai.msu.ru>

A.Gabovich, V.Yurkov, Yu.Sergienko, D.Varda
Blagoveschensk Educational State University, Blagoveschensk

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

V.Krushinski, I.Zalozhnich, A. Popov
Ural State University, Kourovka

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

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

MASTER-Amur  robotic telescope (MASTER-Net: http://observ.pereplet.ru) 
located in Blagoveschensk was pointed to the  GRB160228A 20 sec after 
notice time and 40 sec after trigger time at 2016-02-28 17:35:12 UT. On 
our first (10s exposure)  set we haven`t found optical transient  within 
SWIFT error-box (Malesani et al., GCN 19107) and at GROND OT 
position (Delvaux et al., GCN 19114).
The 5-sigma upper limit has been about 15.1 mag (unfilterd).

We have 3 images during extended emission (Stamatikos et al., GCN 19113) 
with limit 15.2 .

The message may be cited.