TITLE:   GCN CIRCULAR
NUMBER:  29652
SUBJECT: GRB 210312B: MASTER OT confirmation
DATE:    21/03/12 22:55:02 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,F.Balakin,  V.Vladimirov, A.Kuznetsov,K.Zhirkov,D. Vlasenko, I.Gorbunov, D.Zimnukhov, 
V.Senik, A.Chasovnikov,A.Pozdnyakov,V.Topolev, D.Cheryasov(Lomonosov Moscow State University, SAI, Physics Department),
D. Buckley (South African Astronomical Observatory),
R. Podesta, C.Lopez, F. Podesta, C.Francile (Observatorio Astronomico FelixAguilar OAFA),
R. Rebolo, M. Serra(The Instituto de Astrofisica de Canarias),
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 (Blagoveschensk Educational StateUniversity)

MASTER Global robotic net (MASTER-Net:http://observ.pereplet.ru Lipunov et al.,2010,Advances in Astronomy,2010,30L)
automatically started (Lipunov et al. GCN 29649)
Integral  GRB 210312B (Mereghetti et al. GCN 29650,Ttrigger=20:52:17UT)
optical observations at MASTER-Kislovodsk at 2021-03-12 20:52:58 UT 
27s after notice time(41s after trigger time),
and 
at MASTER-Tunka at 2021-03-12 20:52:58UT with mli18.7 at first 10s images.
We confirm Jelinek et al. GCN 29651 (Ondrejov) optical counterpart with 
unfiltered m_OT=18.2 at first image.

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