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GCN Circular 19612

GRB 160625B: Global MASTER-Net prompt optical emission detection
2016-06-28T14:05:38Z (8 years ago)
Vladimir Lipunov at Moscow State U/Krylov Obs <>
E. Gorbovskoy, V. Lipunov, N.Tyurina, V.Kornilov,
P.Balanutsa,  A.Kuznetsov, D.Kuvshinov,
Lomonosov Moscow State University, Sternberg Astronomical Institute

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

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

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

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

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

Ricardo Podesta, Carlos Lopez and Federico Podest
Observatorio Astronomico Felix Aguilar (OAFA)

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

MASTER-IAC  robotic telescope (MASTER-Net:
was pointed to the  GRB 160625B (Burns et al., GCN19581) 31 sec after GBM
notice time   and  57 sec after GBM trigger (131 sec before LAT Trigger, 
Dirirsa et al., GCN 19580)    at 2016-06-25 22:41:13UT .

Starting from this time we continiously observed Swift X-ray 
error box (Melandri et al., GCN 19585) by MASTER-IAC wide field camera 
with 5 sec unfiltered exposition. We have several thousands frames.
The OT appears at 22 43 30 (+- 2.5 sec) UT and rised to  maximum ~8 mag 
after  ~5 sec  at RATIR position (Troja et al., GCN 19588).

The prompt optical emission strongly correlated with Konus Wind gamma ray 
light curve ( Svinkin et al., GCN 19604 ).

MASTER-IAC  robotic telescope  started OT error box observation 43 
sec after  LAT notice time and 95 sec after trigger time at 2016-06-25 22:44:59
in two polarisations. The OT was about ~ 9.7 mag at this moment ( 0.2B + 
0.8R with respect  to USNOB1.0 stars)

The delay with publication connected with installation new MASTER 
telescope at Argentina (

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