IceCube-241113A

The IceCube Collaboration (http://icecube.wisc.edu/) reports:

On 2024-11-13 00:22:20.68 UT IceCube detected a track-like event with a moderate probability of being of astrophysical origin. The event was selected by the ICECUBE_Astrotrack_Bronze alert stream. The average astrophysical neutrino purity for Gold alerts is 30%. This alert has an estimated false alarm rate of 3.8708 events per year due to atmospheric backgrounds. The IceCube detector was in a normal operating state at the time of detection.

After the initial automated alert (https://gcn.gsfc.nasa.gov/notices_amon_g_b/140078_30891383.amon), more sophisticated reconstruction algorithms have been applied offline, with the direction refined to:

Date: 2024-11-13
Time: 00:22:20.68 UT
RA: 196.17 (+0.60, -0.60 deg 90% PSF containment) J2000
Dec: 8.57 (+0.77, -0.83 deg 90% PSF containment) J2000

We encourage follow-up by ground and space-based instruments to help identify a possible astrophysical source for the candidate neutrino.

No Fermi 4FGL or 3FHL catalog sources are in the 90% uncertainty region. 4FGL J1301.6+0834 (4FGL catalog source) at RA = 195.41 deg and Dec = 8.57 deg is the closest known source, located just outside the 90% uncertainty region (0.75 deg away from the best-fit position).

The IceCube Neutrino Observatory is a cubic-kilometer neutrino detector operating at the geographic South Pole, Antarctica. The IceCube realtime alert point of contact can be reached at roc@icecube.wisc.edu

L. Pfeiffer (Univ. of Wuerzburg), S. Buson (DESY, Univ. of Wuerzburg), C. Bartolini (INFN Bari), S. Garrappa (Weizmann Institute of Science) and J. Sinapius (DESY) and P. M. Veres (Ruhr University Bochum) on behalf of the Fermi-LAT collaboration:

We report an analysis of observations of the vicinity of the high-energy IC-241113A neutrino event (GCN 38200
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 ) with all-sky survey data from the Large Area Telescope (LAT), on board the Fermi Gamma-ray Space Telescope. The IceCube event was detected on 2024-11-13 00:22:20.68 UTC (T0) with J2000 position RA = 196.17 (+0.60, -0.60) deg, Decl. = 8.57 (+0.77, -0.83) deg 90% PSF containment.

No cataloged gamma-ray sources are found within the 90% IC-241113A localization error (Fourth Fermi-LAT catalog, 4FGL-DR4, The Fermi-LAT collaboration 2023, arXiv:2307.12546
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 ).

We searched for the existence of intermediate (days to years) timescale emission from a new gamma-ray transient source. Preliminary analysis indicates no significant (>5sigma) new excess emission (> 100 MeV) within the IC-241113A 90% confidence localization. Assuming a power-law spectrum (photon index = 2.0 fixed) for a point source at the IceCube best-fit position, the >100 MeV flux upper limit (95% confidence) is <4.75e-10 ph cm^-2 s^-1 for ~16-years (2008-08-04 / T0), <1.03e-08(<5.19e-08) ph cm^-2 s^-1 for a 1-month (1-day) integration time before T0.

Since Fermi normally operates in an all-sky scanning mode, regular monitoring of this source will continue. For this source, the Fermi-LAT contact person is L. Pfeiffer (leonard.pfeiffer at stud-mail.uni-wuerzburg.de). 

The Fermi LAT is a pair conversion telescope designed to cover the energy band from 20 MeV to greater than 300 GeV. It is the product of an international collaboration between NASA and DOE in the U.S. and many scientific institutions across France, Italy, Japan and Sweden.

The IceCube Collaboration (http://icecube.wisc.edu/) reports:

IceCube has performed a search [1] for additional track-like muon neutrino events arriving from the direction of IceCube-241113A (https://gcn.nasa.gov/circulars/38200
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 ) in a time range of 1000 seconds centered on the alert event time (2024-11-13 00:14:00.680 UTC to 2024-11-13 00:30:40.680 UTC) during which IceCube was collecting good quality data. Excluding the event  that prompted the alert, zero track-like events are found within the 90% containment region of IceCube-241113A. The IceCube sensitivity to neutrino point sources with an E^-2.5 spectrum (E^2 dN/dE at 1 TeV) within the locations spanned by the 90% spatial containment region of IceCube-241113A is 1.3e-01 GeV cm^-2 in a 1000 second time window. 90% of events IceCube would detect from a source at this declination with an E^-2.5 spectrum have energies in the approximate energy range between 2e+02 GeV and 1e+05 GeV. 

A subsequent search was performed including 2 days of data centered on the alert event time (2024-11-12 00:22:20.680 UTC to 2024-11-14 00:22:20.680 UTC). In this case, we report a p-value of 1.00, consistent with no significant excess of track events. The IceCube sensitivity to neutrino point sources with an E^-2.5 spectrum (E^2 dN/dE at 1 TeV) within the locations spanned by the 90% spatial containment region of IceCube-241113A is 1.5e-01 GeV cm^-2 in a 2 day time window. 

The IceCube Neutrino Observatory is a cubic-kilometer neutrino detector operating at the geographic South Pole, Antarctica. The IceCube realtime alert point of contact can be reached at roc@icecube.wisc.edu.

[1] IceCube Collaboration, R. Abbasi  et al., ApJ 910 4 (2021)

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
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 ) 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
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 )

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 ).