TITLE:   GCN CIRCULAR
NUMBER:  25433
SUBJECT: GRB 190821A: MASTER do not see any afterglow candidate 
DATE:    19/08/21 19:01:27 GMT
FROM:    Vladimir Lipunov at Moscow State U/Krylov Obs  <lipunov@xray.sai.msu.ru>

V. Lipunov, F.Balakin, E. Gorbovskoy, V. Kornilov, N.Tyurina, 
P.Balanutsa,A.Kuznetsov, F.Balakin, V. Vladimirov, D. Vlasenko,
I. Gorbunov,D.Zimnukhov, V.Senik, A.Chasovnikov, A.Pozdnyakov, 
A.Chasovnikov, 
V.Topolev, D.Kuvshinov(Lomonosov Moscow State University, SAI, Physics 
Department),
R. Rebolo, M. Serra (The Instituto de Astrofisica de Canarias IAC),
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),
D. Buckley (South African Astronomical Observatory SAAO),
O. Gress, N.M. Budnev, O.Ershova (Irkutsk State University, API),
A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo 
Observatory),
V. Yurkov, A. Gabovich, Yu. Sergienko (Blagoveschensk Educational State 
University)

There is known star at Swift XRT position (GCN 25427, GCN 25431).
Its brightnes not changes during 1 hour, after 41 sec after trigger in 
MASTER images (GCN  25429).
This message may be cited.