TITLE:   GCN CIRCULAR
NUMBER:  29959
SUBJECT: ZTF21aayokph (AT2021lfa): MASTER OT detection 3h befor ZTF
DATE:    21/05/07 16:23:38 GMT
FROM:    Vladimir Lipunov at Moscow State U/Krylov Obs  <lipunov@xray.sai.msu.ru>

V. Lipunov, V.Kornilov, E.Gorbovskoy, I.Gorbunov,P.Balanutsa,V.Vladimirov,A.Kuznetsov,
D. Vlasenko, N.Tiurina, D.Zimnukhov, V.Senik,V.Topolev, A.Chasovnikov, K.Zhirkov, D.Cheryasov (Lomonosov MSU,SAI,PhysicsDepartment),
D. Buckley (South African Astronomical Observatory),
O.A. Gres, N.M. Budnev (Irkutsk State University, API),
R. Podesta, C.Lopez, F. Podesta, C.Francile (Observatorio Astronomico FelixAguilar OAFA),
R. Rebolo, M. Serra(The Instituto de Astrofisica de Canarias),
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)
observed 12:32:48.725 -01:29:22.56  in survey mode (several images per night, not sequential, with different centers)
at MASTER-OAFA ~3h befor Zwicky detection (2021-05-04 05:34:39.360UT in TNSTR1478, Yao et al. GCN 29938).

There is optical source detected by MASTER auto-detection system as
MASTER OT J123248.62-012924.5 (sigma ~1")

We have nearest reference images at 2021-05-01 04:49:38UT.
Reduction will be continued.