TITLE: GCN CIRCULAR NUMBER: 39614 SUBJECT: IceCube-241016A: MASTER flaring blazar 5BZU J073038.29-320820.2 with Zhirkov effect DATE: 25/03/07 13:19:38 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs lipunov@xray.sai.msu.ru
K. Labzina, K.Zhirkov, V.Lipunov, E.Gorbovskoy, A.Kuznetsov, G.Antipov, D.Vlasenko, A.Kuznetsov, N.Tyurina, P.Balanutsa, A.Chasovnikov, V.Topolev, Ya.Kechin, V.Senik, Yu.Tselik (Lomonosov MSU), O.Gress, N.Budnev, O.Ershova (ISU), C.Francile, F. Podesta, R.Podesta, E. Gonzalez (Observatorio Astronomico Felix Aguilar (OAFA), D.Buckley (SAAO), A.Sosnovskij (Crao RAS), A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory), A. Gabovich, V.Yurkov (Blagoveschensk Educational StateUniversity), R.Rebolo (The Instituto de Astrofisica de Canarias), L.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez,A.R.Corella, L.H.Rodriguez (INAOE, Guillermo Haro Astrophysics Observatory)
MASTER Global Robotic Net ( Lipunov et al., Advances in Astronomy, 2010, 30L ) started IceCube-241016A alert (GCN#37794, trigger No 2910365,07h 29m 18.96s , -33d 31m 44.4s, R=0.87) errorbox 69 sec after notice time (167 sec after trigger time) at 2024-10-16 01:01:19 UT with upper limit up to 17.7 mag (Lipunov et al.GCN#37793)
MASTER cover map: https://master.sai.msu.ru/site/master2/observ.php?id=2639656
We observed it in MASTER-SAAO and MASTER-OAFA and analyzed MASTER archive images since 2015 of the sources, that can be related with this event. We detected variability of blazar 5BZU J073038.29-320820.2, located inside 3 sigma IC error-box https://vizier.cds.unistra.fr/viz-bin/VizieR?-source=&-out.add=_r&-o...
We detected its brightening up to 16.0m at alert time at MASTER archive light curve from 2015 year: http://observ.pereplet.ru/IC/MASTER_IC241016A.jpg
Light curve also shows that a few days after neutrino alert this blazar returned to its original state.
This, we report observation of an Zhirkov effect, discovered earlier (The Astrophysic Jornal Letters, 896, L19, 2020 https://ui.adsabs.harvard.edu/abs/2020ApJ...896L..19L/abstract ).
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