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GCN Circular 36603

Subject
GRB 240529A: MASTER prompt OT detection
Date
2024-06-03T05:40:18Z (10 days ago)
From
Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>
Via
legacy email
V.Lipunov (MSU), D.Buckley (SAAO),
K.Zhirkov, G.Antipov, E.Gorbovskoy, A.Kuznetsov, D.Vlasenko, P.Balanutsa,
N.Tiurina, Ya.Kechin, Yu.Tselik, D.Zimnukhov, V.Senik, A.Yudin, V.Topolev,
A.Chasovnikov,D.Cheryasov(Lomonosov MSU,SAI,PhysicsDepartment),
O.Gress, N.Budnev(ISU),
A.Sosnovskij (Crimean Astrophysical Observatory, RAS),
C.Francile.  F. Podesta, R.Podesta (Observatorio Astronomico Felix AguilarOAFA),
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 (http://observ.pereplet.ru Lipunov etal.,2010,Advances in Astronomy,2010,30L)
started observation (Lipunov et al. GCN 36555)  of Swift GRB240529A (Eyles-Ferris et al. GCN36556, Ttrigger= 02:58:31UT)
in MASTER-SAAO at 3 degrees altitude at 2024-05-29 02:59:20 by wide-field MASTER-II camera and
at 2024-05-29 02:59:16 (44s after GRB time) by very wide field MASTER-VWF camera.

The optical transient MASTER OT J222126.06+513344.6 clearly detected since
03:00:20 with m_OT~14.5 at first maximum and with possible second maximum  at light curve
during prompt emission of this GRB (Swift-BAT lightcurve Markwardt,Barthelmy et al. GCN36566)

The reduction of first 40 images from MASTER-VWFC since 2024-05-29 02:59:16  with OT substraction will be continued.

Observations started at zenith distance = 87 deg. The sun  altitude was  -31.0deg.
The galactic latitude b = -5 deg., longitude l = 101 deg.

Real time updated cover map and OT discovered available here:
https://master.sai.msu.ru/site/master2/observ.php?id=2474976


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