TITLE:   GCN CIRCULAR
NUMBER:  39566
SUBJECT: IceCube-241113A: MASTER flaring blazar 5BZB J1311+0853 with Zhirkov effect
DATE:    25/03/03 09:56:46 GMT
FROM:    Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>

K. Labzina,  K.Zhirkov, V.Lipunov, E.Gorbovskoy, G.Antipov, D.Vlasenko,
A.Kuznetsov, N.Tyurina, P.Balanutsa, A.Chasovnikov, D.Kuvshinov,
V.Topolev,Ya.Kechin,Yu.Tselik, K.Minkina(Lomonosov Moscow State University, SAI, Physics Department),
O.Gress, N.Budnev, O.Ershova (ISU),
C.Francile,  F. Podesta, R.Podesta, E. Gonzalez  (Observatorio Astronomico Felix Aguilar (OAFA),
D.Buckley (SAAO), 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-Kislovodsk robotic telescope  (Global MASTER-Net:  http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L)  located in Russia (Lomonosov MSU, Kislovodsk Solar Station of Pulkovo observatory)
started IceCube-241113 (IceCube, Zegarelli et al. GCN#38200) to the IceCube Alert 241113.02 (trigger No 30891383, 13h 04m 46.32s , +08d 29m 27.6s, R=0.53)
errorbox  477 sec after notice time and 554 sec after trigger time at 2024-11-13 00:31:35 UT,
with upper limit up to  16.0 mag. (Lipunov et al. GCN#38186)

MASTER cover map: https://master.sai.msu.ru/site/master2/observ.php?id=2668204


We analyzed MASTER archive images since 2012 of the sources, that can be related with this event.
We detected blazar J131155.76+085340.9 inside 3 sigma
https://vizier.cds.unistra.fr/viz-bin/VizieR?-source=&-out.add=_r&-out.add=_RAJ%2C_DEJ&-sort=_r&-to=&-out.max=20&-meta.ucd=2&-meta.foot=1&-c=197.98233333333+8.8946944444444&-c.rs=5

and we detected its brightening up to 16.9m during last nights observations.


The MASTER archive light curve from 2010 year is available at
http://observ.pereplet.ru/MASTER_IC241113A.jpg

Light curve shows that after neutrino alert the blazar J131155.76+085340.9 was in a dim state 20.2m, after which, within an half hour, it increased its brightness to 16.9m.
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 ).