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GCN Circular 17237

GRB 141225A: MASTER-SAAO first OT detection
2014-12-26T10:41:39Z (9 years ago)
Vladimir Lipunov at Moscow State U/Krylov Obs <>
D.Buckley, S. Potter, A. Kniazev, M. Kotze
South African Astronomical Observatory

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

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

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

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

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

H. Levato and C. Saffe
Instituto de Ciencias Astronomicas de la Tierra y del Espacio (ICATE),
San Juan, Argentina

C. Mallamacci, C. Lopez and F. Podest
Observatorio Astronomico Felix Aguilar (OAFA), San Juan National University, 

MASTER-SAAO  robotic telescope (MASTER-Net:
installed several days ago  in South African Astronomical
Observatory (Sutherland) was automatically  pointed
to the  Swift and Fermi GRB 141225A (Avanzo  et. al. GCN 17229).
Firstly MASTER-SAAO pointed by FERMI coordinates and made first exposure 
28 sec. after FERMI trigger at  2014-12-25 23:02:28 UT.
Then MASTER-SAAO pointed to the  Swift coordinates 20 sec after  Swift 
notice time and 113 sec after trigger time at 2014-12-25 23:03:00 UT in 
two polarizations.

MASTER-SAAO discovered OT source (Gorosabel et. al. 17230, Malesani et. al 
17232, Kuin et. al 17233, Xu et. al 17236):

Ra:   09:15:06.94
Dec: +33:47:30.87
Mag:  17.5

The source is visible on the subsequent frames. The data reduction is 
Our  band  is well described by a parity 0.8R+0.2B (USNO B1).

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