TITLE:   GCN CIRCULAR
NUMBER:  17690
SUBJECT: GRB 150413A: MASTER very bright unusual OT observations  
DATE:    15/04/13 14:46:33 GMT
FROM:    Vladimir Lipunov at Moscow State U/Krylov Obs  <lipunov@xray.sai.msu.ru>

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


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


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


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

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


V.Krushinski, I.Zalozhnih,  A. Popov
Ural Federal University, Kourovka

Hugo Levato and Carlos Saffe
Instituto de Ciencias Astronomicas, de la Tierra y del Espacio (ICATE)

Claudio Mallamaci, Carlos Lopez and Federico Podest
Observatorio Astronomico Felix Aguilar (OAFA)



MASTER II  robotic telescope (MASTER-Net: http://observ.pereplet.ru) located in 
Tunka was pointed to the  GRB150413A (Markwardt et al. GCN 17688) 132 s.
After MASTER OT J124141.98+715028.0 detection (Ivanov et all, GCN 17689) 
we see obvious brightening on next 4 expozition sets in two polarizations.

After 18 min MASTER OT J124141.98+715028.0 is about 14.7 !



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