[vsnet-grb-info 24456] GRB 191221B: MASTER VWFC OT yearly detection

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  26555
SUBJECT: GRB 191221B: MASTER VWFC OT yearly detection 
DATE:    19/12/22 14:31:51 GMT
FROM:    Vladimir Lipunov at Moscow State U/Krylov Obs  <lipunov at 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),
D. Buckley(South African Astronomical Observatory),
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),
O.A. Gres, N.M. Budnev, O.Ershova (Irkutsk State University, API),
V. Yurkov, A. Gabovich, Yu. Sergienko(Blagoveschensk Educational State
University)

We found first image with error box at 2019-12-21 20:40:15  (62 sec after 
trigger time).


MASTER-OAFA Very Wide Field Camera  detected OT in Swift GRB 191221B
(Laha et al GCN 26534; Lipunov et al.,  GCN 26537; Kuin, GCN 26538;
Gokuldass et al., GCN 26551; Vielfaure et al., GCN 26553;) error-box
at coordinates at 2019-12-21 20:41:35 UT  (142 s after trigger time).
with m_OT~10.5 mag.



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