GCN Circular 31948
Subject
IceCube-220425A: MASTER: flaring blazar TXS 1742-078 as the possible neutrino source candidate
Date
2022-04-25T15:44:17Z (3 years ago)
From
Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>
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),
L.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez,
A.Corella, L.H.Rodriguez
(INAOE, Guillermo Haro Astrophysics Observatory),
N.M.Budnev, O.Gress,
(ISU,API),
C.Francile, R. Podesta, C.Lopez, F. Podesta
(Observatorio Astronomico Felix Aguilar OAFA),
D.A.H.Buckley
(SAAO),
R. Rebolo, M. Serra
(The Instituto de Astrofisica de Canarias),
V.Senik, A. Tlatov, D. Dormidontov
(Kislovodsk Solar Station of the Pulkovo Observatory),
A. Gabovich, V.Yurkov
(Blagoveschensk Educational State University)
MASTER-OAGH was the first telescope of MASTER-NET to observe IC-220425's
error-box at 2022-04-25 06:35:11 UTC, 13813 sec after the trigger
(Lipunov et al., GCN #31946).
We report on the detection of a flaring blazar TXS 1742-078 (RA=266.3629
Dec=-7.8844).
IC-220425A is a track-like event with an estimated energy of 600 TeV and
signalness of 17%. It was detected at 2022-04-25 02:44:58 UTC
and is centred at RA=268.24 (+1.98, -1.66 deg, 90% PSF containment),
Dec=-10.73 (+1.71, -1.48 deg, 90% PSF containment) J2000(GCN #31944).
The first image of TXS 1742-078 was obtained at 2022:04-25 06:36:32 UTC.
It is located 3.4 deg away from the center of error-box.
Based on our photometry, the blazar is currently experiencing a flaring
episode (W=17.3+/-0.1, no correction for extinction), compared to its
quiscence state (W=19.2+/-0.3). Judging from ATLAS observations(Smith et
al, PASP 132, 2020)(https://fallingstar-data.com/forcedphot/queue/195704/plot.pdf) it is
31944the brightest flare since 2017.
Interestingly enough, after the correction for galactic
extinction(Schlafly and Finkbeiner, 2011) (A_V=3.18), magnitude of TXS
1742-078 (W=14.1+/-0.1) is close to that of TXS 0506+056 during IC-170922A
(W=14.3, no correction for extinction).
Judging from these facts, we highly encourage multiwavelength observations
to determine whether or not this blazar is a source of IC-220425A
The observation and reduction will continue.
The message may be cited.