TITLE:   GCN CIRCULAR
NUMBER:  26954
SUBJECT: GRB 200131A: MASTER optical transient detection
DATE:    20/01/31 23:13:16 GMT
FROM:    Vladimir Lipunov at Moscow State U/Krylov Obs  <lipunov@xray.sai.msu.ru>

V. Lipunov, N.Tyurina, E. Gorbovskoy, O.Gress, V.Kornilov, P.Balanutsa,A.Kuznetsov,
V. Vladimirov, D. Vlasenko, F.Balakin, I.Gorbunov, D.Zimnukhov, V.Senik, T.Pogrosheva,
D. Kuvshinov, V.Shumkov (Lomonosov Moscow State University, SAI, Physics Department),
D. Buckley(South African Astronomical Observatory),
R. Rebolo, M. Serra(The Instituto de Astrofisica de Canarias),
A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory),
R. Podesta, C.Lopez, F. Podesta, C.Francile(Observatorio Astronomico Felix Aguilar OAFA),
H. Levato(Instituto de Ciencias Astronomicas, de la Tierra y del Espacio ICATE),
O.A. Gres, N.M. Budnev, O.Ershova (Irkutsk State University, API),
V. Yurkov, A. Gabovich, Yu. Sergienko(Blagoveschensk Educational State University)

MASTER Global Robotic Net (http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy,v. 2010, 30L)
started Swift GRB 200131A (Sbarufatti et al. GCN 26953) alert observation 
50s after trigger time (Lipunov et al. GCN 26952) at MASTER-Tunka and 78s 
after trigger time at MASTER-IAC.

MASTER auto-detection system found 
MASTER OT J001222.56+510700.3 at 
RA,Dec(2000) = 00h 12m 22.56s , +51d 07m 00s.3
with m_OT=14.5 (unfiltered) at the first exposition (10s)
with optical decay ,
also detected by Swift UVOT (GCN 26953)

Observation and reduction will be continued