TITLE:   GCN CIRCULAR
NUMBER:  28348
SUBJECT: GRB 200901A: MASTER OT early detection
DATE:    20/09/02 12:59:10 GMT
FROM:    Vladimir Lipunov at Moscow State U/Krylov Obs  <lipunov@xray.sai.msu.ru>

V. Lipunov, V.Kornilov, E.Gorbovskoy, N.Tiurina, P.Balanutsa, A.Kuznetsov, K.Zhirkov, F.Balakin,
V.Vladimirov, D. Vlasenko, I.Gorbunov, D.Zimnukhov, V.Senik, A.Chasovnikov, A.Pozdnyakov, D.Cheryasov(Lomonosov Moscow State University, SAI, Physics Department),
R. Podesta, C.Lopez, F. Podesta, C.Francile (Observatorio Astronomico Felix Aguilar OAFA),
R. Rebolo, M. Serra(The Instituto de Astrofisica de Canarias),
D. Buckley (South African Astronomical Observatory),
O.A. Gres, N.M. Budnev (Irkutsk State University, API),
A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory),
A. Gabovich, V.Yurkov, Yu. Sergienko (Blagoveschensk Educational State University)

MASTER-OAFA robotic telescope (Global MASTER-Net http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, v.2010, 30L)
started in alert mode (Lipunov et al. GCN 28334)
Swift GRB 200901A  (Simpson et al. GCN 28335,  Sakamoto et al. GCN 28344) 
errorbox observation 25s after notice time (46s after trigger time) at 2020-09-01 03:48:18 UT.

There is OT at XRT (Kennea et al. GNC 28341) and UVOT (Breeveld et al. GCN 28342) position
first 20 minutes after trigger time.

Data analysis will continue.