TITLE:   GCN CIRCULAR
NUMBER:  26537
SUBJECT: GRB 191221B: MASTER OT detection
DATE:    19/12/21 21:44:15 GMT
FROM:    Vladimir Lipunov at Moscow State U/Krylov Obs  <lipunov@xray.sai.msu.ru>

V. Lipunov,  E. Gorbovskoy, V.Kornilov, N.Tyurina, P.Balanutsa,A.Kuznetsov,F.Balakin,
V.Vladimirov, D. Vlasenko, I.Gorbunov, D.Zimnukhov, V.Senik, T.Pogrosheva,
D.Kuvshinov(Lomonosov Moscow State University, SAI, Physics Department),
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),
R. Rebolo, M. Serra(The Instituto de Astrofisica de Canarias),
D. Buckley(South African Astronomical Observatory),
O.A. Gres, N.M. Budnev, O.Ershova (Irkutsk State University, API),
V. Yurkov, A. Gabovich, Yu. Sergienko(Blagoveschensk Educational State
University)

MASTER auto-detection system discovered OT in Swift GRB 191221B (Laha et 
al GCN 26534) error-box
at coordinates

RA,Dec(2000)=10h 19m 19.24s , -38d 09m 28s.7

with quick decay  with m_OT=14.4 at 2019-12-21 21:07:33 UT



The observation and reduction will be continued. The message may be cited.