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GCN Circular 35914

GRB 240310A: MASTER OT J200702.72-263928.7 inside 3sigma
2024-03-12T09:59:24Z (4 months ago)
Vladimir Lipunov at Moscow State U/Krylov Obs <>
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V.Lipunov, V.Shumkov (Lomonosov MSU),D.Buckley (SAAO),D.Svinkin (Ioffe Institute, Konus-Wind),
A.Kuznetsov, P.Balanutsa, K.Zhirkov, N.Tiurina, G.Antipov, E.Gorbovskoy (Lomonosov MSU),
Ya.Kechin, D.Vlasenko, Yu.Tselik, V.Topolev, B.Rudenko, M.Gulyaev, V.Vladimirov, D.Zimnukhov,
V.Senik, A.Yudin, A.Chasovnikov, D.Cheryasov (Lomonosov MSU,SAI,PhysicsDepartment),
O.A. Gress, N.M. Budnev (Irkutsk State University, API),
C.Francile.  F. Podesta, R.Podesta (Observatorio Astronomico Felix Aguilar OAFA),
A.Sosnovskij (Crimean Astrophysical Observatory, RAS),
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 ( Lipunov et al.,2010,Advances in Astronomy,2010,30L)
started Fermi (GCN 35908,trig=05:40:08) GRB 240310A inspection (cover map in Lipunov et al. GCN 35910)
in MASTER-Amur, MASTER-SAAO, AMSTER-Tunka, MASTER-Kislovodsk, MASTER-Tavrida

During inspection inside 3-sigma error-box (see map in GCN35910)
MASTER auto-detection system found new OT, not presented in MASTER database since 2003, in VIZIER, in CRTS database

MASTER OT J200702.72-263928.7 / AT2024efb discovery

OT source at (RA, Dec) = 20h 07m 02.72s -26d 39m 28.7s on 2024-03-12.06429 UT.

The OT unfiltered magnitude is 16.8m at 3 images (mlim=18.7).

There is no minor planet at this place (we excluded 1999CO47 with m_V=20.8m in 14.4"W,0.6"N ).

We used reference image on 2018-10-07.86227 UT with  unfiltered mlim=19.9m between thousands archive images.

Spectral observations are required.

the association of this object with the gamma ray burst is not obvious

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