[vsnet-grb-info 17652] GRB 160225A: MASTER-Amur observations

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  19089
SUBJECT: GRB 160225A: MASTER-Amur  observations 
DATE:    16/02/26 09:27:38 GMT
FROM:    Vladimir Lipunov at Moscow State U/Krylov Obs  <lipunov at xray.sai.msu.ru>

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

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

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

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

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

MASTER II  robotic telescope (MASTER-Net: http://observ.pereplet.ru)
located in Blagoveschensk was pointed to the  GRB160225A 20 sec after
notice time and 204 sec after Swift BAT trigger (Siegel et al, 19075) 
time at 2016-02-25 14:24:20 UT (Gabovich  et al, 19076).

We did not see any OT brighter 2-sigma. Our unfiltered camera sensitive up 
to 10  mk.


  Id 	 t_start-t_trigger    t_mean-t_trig   Exp.time  	Limit
                   s                 s            s            unfiltered

767291		204                224          40	        17.4
767293          256                281          50              17.6 
767295          318                348          60              17.0
769139          318                768         600              18.7 
769244          318               1187	      1200 	        19.0

Our unfiltered magnitude calibrated to USNOB1 stars as m =0.2B + 0.8R .

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