GCN Circular 39405
Subject
IceCube-250207A: MASTER flaring blazar QSOJ0854+2006 with Zhirkov effect
Date
2025-02-21T11:20:59Z (a day ago)
Edited On
2025-02-21T15:01:26Z (21 hours ago)
From
Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>
Edited By
Judith Racusin at NASA/GSFC <judith.racusin@nasa.gov> on behalf of Vladimir Lipunov at Lomonosov Moscow State University <lipunov@sai.msu.ru>
Via
email
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)
MASTER600-Tunka robotic telescope located in Russia (Applied Physics Institute, Irkutsk State University; Lipunov, Kornilov, Gorbovskoy, Tiurina & Kuznetsov, 2023, Astronomical Robotic Networks and Operative Multichanel Astrophysics, Lomonosov MSU PRESS, 591,
pp.http://www.pereplet.ru/lipunov/625.html#625)
started IceCube-250207A (IceCube GCN#39203)of the Ice Cube Alert 250207.09 error box ~11h after trigger time at 2025-02-07 13:53:05 UT, with upper limit up to 19.2 mag.
(see cover map:
https://master.sai.msu.ru/site/master2/observ.php?id=2770114)
We analyzed MASTER archive images since 2010 of the source, that can be related with this event.
Global MASTER Net detected QSOJ0854+2006 inside 1 sigma. QSOJ0854+2006 (https://simbad.u-strasbg.fr/simbad/sim-coo) fading to 16.6m
during last nights observations.
Fortunately, data from the ATLAS network (Tonry et al., 2018, PASP, 13, 164505) are available, which show that ~24 hours before the neutrino alert (05.13 feb 2025.) the blazar QSOJ0854+2006 was at its local standard brightness, it was 1 magnitude brighter: 15.1 . After a few days, the blazar returned to its original bright state.
Thus, we report the observation of an Zhirkov effect discovered earlier (The Astrophysical Journal Letters, 896, L19, 2020) .
The MASTER archive light curve from 2010 year is available at
http://www.pereplet.ru/lipunov/images/ATbbo_galaxy_arhive_midi.jpg