TITLE: GCN CIRCULAR NUMBER: 37617 SUBJECT: NuEm-240926A / IC240926A: BZQJ0955+4532 ~0.6m optical decay and rebrightening detection by MASTER DATE: 24/09/27 10:49:56 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs lipunov@xray.sai.msu.ru

V.Lipunov, K.Zhirkov, D.Vlasenko, I.Panchenko, A.Kuznetsov (Lomonosov MSU), A.Sosnovskij (CrAO RAS), P.Balanutsa, G.Antipov, N.Tiurina, E.Gorbovskoy, M.Gulyaev, Ya.Kechin, V.Senik (Lomonosov MSU), O.Gress, N.Budnev(ISU), D.Buckley (SAAO), C.Francile. F. Podesta, R.Podesta (Observatorio Astronomico Felix AguilarOAFA), R. Rebolo (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 et al.,2010,Advances in Astronomy,2010,30L) started observation of NuEm-240926A / IC240926A alert (Ayala et al. GCN 37614, The HAWC transit interval: 2024/09/26 13:12:19-19:01:26 UT, socket notice=19:10:33 ) at MASTER-Amur (2024-09-26 19:16:05, clouds, summary reduction) and at MASTER-Tavrida (just after the error-box rise since 21:59:06).

We found the blazar BZQJ0955+4532 to be in the off-state in first hours and then switched to the on-state no later than several hours (so as trigger time is not known now) after the event. The amplitude of this variability is about 0.6m (calibrated by field stars from our 4 square degrees field of view).

This effect is observed the same as for TXS 0506+056, also found by MASTER for IC170922 (Lipunov et al. ApJL 896, 2, L19 https://ui.adsabs.harvard.edu/abs/2020ApJ...896L..19L/abstract )

Observations and reduction will be continued.

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