IceCube-190712A

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

On 12 July 2019 at 01:15:17.38 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 threshold astrophysical neutrino purity for  Bronze alerts is 30%. This alert has an estimated false alarm rate of 2.6 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/132814_44222682.amon ), more  
sophisticated reconstruction algorithms have been applied offline, with the direction refined to:

Date: 19/07/12
Time:  01:15:17.38 UT
RA: 76.46 (+5.09 -6.83 deg  90% PSF containment) J2000
Dec: 13.06 (+4.48 -3.44 deg 90% PSF containment) J2000

We recognize this event has somewhat larger direction uncertainty compared to the originally reported values.   This is likely due to the shorter than usual track length through the instrumented volume. 

The nearest Fermi 4FGL catalog source is 4FGL J0502.5+1340, located 1.01 degrees from the best-fit location.  Given the size of the 90% containment region, there are several other 4FGL and 3FHL sources in the 90% uncertainty region. 

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

Celia Sanchez-Fernandez (ESAC/ESA, Spain), James Rodi(IAPS-Roma, Italy)
V. Savchenko, C. Ferrigno (ISDC/UniGE, Switzerland)
A. Coleiro (APC, France)
S. Mereghetti (INAF IASF-Milano, Italy)

on behalf of the INTEGRAL multi-messenger collaboration:
https://www.astro.unige.ch/cdci/integral-multimessenger-collaboration

Using combination of INTEGRAL all-sky detectors (following [1]):
SPI/ACS, IBIS/Veto, and IBIS we have performed a search for a prompt
gamma-ray counterpart of IceCube-190712A (GCN 25057
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 ).

At the time of the event (2019-07-12 01:15:17 UTC, hereafter T0),
INTEGRAL was operating in nominal mode. The peak of the event
localization probability was at an angle of 74 deg with respect to the
spacecraft pointing axis. This orientation implies strongly suppressed
(15% of optimal) response of ISGRI, strongly suppressed (33% of
optimal) response of IBIS/Veto, and near-optimal (74% of optimal)
response of SPI-ACS.

The background within +/-300 seconds around the event was very stable
(excess variance 1.2).

We have performed a search for any impulsive events in INTEGRAL SPI-ACS
(as described in [2]), IBIS, and IBIS/Veto data.

We do not detect any significant counterparts and estimate a 3-sigma
upper limit on the 75-2000 keV fluence of 2e-07 erg/cm^2 (within the
50% probability containement region of the source localization) for a
burst lasting less than 1 s with a characteristic short GRB spectrum
(an exponentially cut off power law with alpha=-0.5 and Ep=600 keV)
occurring at any time in the interval within 300 s around T0. For a
typical long GRB spectrum (Band function with alpha=-1, beta=-2.5, and
Ep=300 keV), the derived peak flux upper limit is ~1.7e-07 (6.3e-08)
erg/cm^2/s at 1 s (8 s) time scale in 75-2000 keV energy range.

All results quoted are preliminary.

This circular is an official product of the INTEGRAL Multi-Messengerteam.

[1] Savchenko et al. 2017, A&A 603, A46
[2] Savchenko et al. 2012, A&A541A, 122S






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B. Mailyan (UAH)  and J. Wood (NASA) report on behalf of the Fermi-GBM Team:

For the IceCube high-energy neutrino candidate event 190712A (GCN 25057
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 ),
at the event time Fermi-GBM was observing the reported neutrino location at:

RA: 76.46 (+5.09 -6.83 deg  90% PSF containment) J2000
Dec: 13.06 (+4.48 -3.44 deg 90% PSF containment) J2000


There was no Fermi-GBM onboard trigger around the event time of the
neutrino candidate.

The GBM targeted search, the most sensitive, coherent search for GRB-like
signals, was run from +/-30 s around the neutrino candidate time. From this
search, no significant signal was found related to IceCube-190712A.

We set upper limits on impulsive gamma-ray emission. Using the
representative soft, normal, and hard GRB-like templates
(arXiv:1612.02395
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 ), we report the following 3 sigma flux upper limits over
10-1000 keV (in units of 10^-7 erg/s/cm^2):

Timescale  soft     norm     hard
--------------------------------------
0.128 s:   3.3e-07  6.5e-07  1.4e-06
1.024 s:   8.2e-08  1.9e-07  4.7e-07
8.192 s:   3.0e-08  5.6e-08  1.1e-07

Alexis Coleiro (APC/Universite de Paris) and Damien Dornic (CPPM/CNRS) on behalf of the ANTARES Collaboration. 

Using data from the ANTARES detector, we have performed a follow-up analysis of the recently reported single track-like event IceCube-190712A (GCN 25057
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  <https://gcn.gsfc.nasa.gov/gcn3/25057.gcn3
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 >). The reconstructed origin was 12.9 degrees below the horizon for ANTARES.

No up-going muon neutrino candidate events were recorded within 3 degrees of the IceCube event coordinates during a +/- 1h time-window centered on the IceCube event time, and over which the potential source remained visible all time. A search over an extended time window of +/- 1 day has also yielded no detection (42.5% visibility).

This leads to a preliminary 90% confidence level upper limit on the muon-neutrino fluence from a point source of 16 GeV.cm^-2 over the energy range 4.6 TeV ��� 4.3 PeV (the range corresponding to 5-95% of the detectable flux) for an E^-2 power-law spectrum, and 40 GeV.cm^-2 (812 GeV - 416 TeV) for an E^-2.5 spectrum.

ANTARES <http://antares.in2p3.fr/> is the largest undersea neutrino detector (Mediterranean Sea) and it is primarily sensitive to astrophysical neutrinos in the TeV-PeV energy range. At 10 TeV, the median angular resolution for muon neutrinos is about 0.5 degrees. In the range 1-100 TeV ANTARES has a competitive sensitivity to this position in the sky.

S. Garrappa (DESY-Zeuthen, DE), R. Angioni�(MPIfR-Bonn, Germany)�and S. 
Buson (Univ. of Wuerzburg, DE; UMBC, USA) on behalf of the Fermi-LAT 
collaboration:

We report an analysis of observations of the vicinity of the high-energy 
IC190712A neutrino event (GCN 25057
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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 2019-07-12 01:15:17 UTC 
(T0) with J2000 position RA = 76.46 (+5.09 -6.83) deg, Decl. = 13.06 
(+4.48 -3.44) deg 90% PSF containment.

We searched for the existence of intermediate (months to years) 
timescale emission from a new gamma-ray transient source at the best-fit 
IC190712A position. Preliminary analysis indicates no significant 
(>5sigma) excess emission (>100 MeV) at the best-fit IC190712A position. 
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 < 2.3e-10 ph cm^-2 s^-1 for ~10.9-years (2008-08-04 
/ 2019-07-05 UTC)�and < 6e-9 (1e-7) �ph cm^-2 s^-1 for a 1-month (1-day) 
integration time before T0.

Several cataloged gamma-ray sources are found within the 90% PSF 
containment of IC190712A position. None of these is significantly 
detected in the 1-month and 1-day scale�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 persons are�S. Garrappa (simone.garrappa at desy.de 
<http://desy.de/>) and R. Angioni (angioni atmpifr-bonn.mpg.de 
<http://mpifr-bonn.mpg.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.

Y. G. Zheng, C. Cai, Q. Luo, S. Xiao, Q. B. Yi, 
Y. Huang, C. K. Li, G. Li, X. B. Li, J. Y. Liao, S. L. Xiong,
C. Z. Liu, X. F. Li, Z. W. Li, Z. Chang, A. M. Zhang, 
Y. F. Zhang, X. F. Lu, C. L. Zou (IHEP), Y. J. Jin, 
Z. Zhang (THU), T. P. Li (IHEP/THU), F. J. Lu, L. M. Song, 
M. Wu, Y. P. Xu, S. N. Zhang (IHEP), 
report on behalf of the Insight-HXMT team:

Insight-HXMT was taking data normally around the trigger time
(T0=2019-07-12 01:15:17.38 UTC) of this high-energy neutrino event 
(GCN #25057
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 ), which was monitored without any occultation by 
the Earth. 

Within T0 +/- 100 s, no significant excess events (SNR > 3 sigma) 
are found in a search of the Insight-HXMT/HE raw light curves.

Assuming the counterpart GRB with three typical GRB Band spectral 
models, two typical duration timescales(1 s, 10 s) coming from the position
of this neutrino event, the 5-sigma upper-limits fluence 
(0.2 - 5 MeV, incident energy) are reported below:

Band model 1 (alpha=-1.9, beta=-3.7, Ep=70 keV):
1s:  0.5e-07 erg cm^-2   
10s: 3.1e-07 erg cm^-2 

Band model 2 (alpha=-1.0, beta=-2.3, Ep=230 keV):
1s:  0.8e-07 erg cm^-2   
10s: 5.1e-07 erg cm^-2

Band model 3 (alpha=-0.0, beta=-1.5, Ep=1000 keV):
1s:  2.6e-07 erg cm^-2  
10s: 1.5e-06 erg cm^-2 

Further analysis will be reported in the following circulars.

All measurements above are made with the CsI detectors operating in the
regular mode with the energy range of about 80-800 keV (record energy).
Only gamma-rays with energy greater than about 200 keV can penetrate
the spacecraft and leave signals in the CsI detectors installed inside
of the telescope.

Insight-HXMT is the first Chinese space X-ray telescope, which was 
fundedjointly by the China National Space Administration (CNSA) and 
the Chinese Academy of Sciences (CAS). 
More information could be found at: http://www.hxmt.org.

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

IceCube has performed a search for additional track-like muon neutrino events arriving
from the direction of IceCube-190712A (https://gcn.gsfc.nasa.gov/gcn3/25057.gcn3
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 ) in a time
range of 2 days centered on the alert event time (2019-07-11 01:15:17.38 UTC to 2019-07-13 01:15:17.38 UTC) during which IceCube was collecting good quality data. Excluding the
event that prompted the alert, two additional track-like events are found in spatial coincidence
with the 90% point spread function containment of IceCube-190712A. We find that these data are well described by atmospheric background expectations, with a p-value of 1.0. Accordingly, these data would represent a time-integrated muon-neutrino flux upper limit at the alert position assuming an E^-2 spectrum (E^2 dN/dE) at the 90% CL of 6.6 x 10^-5 TeV cm^-2 for this observation period. 90% of events IceCube would detect from a source at this declination with an E^-2 spectrum are approximately between 1 TeV and 1 PeV.

A subsequent search was performed to include the previous month of data (2019-06-12 01:15:17.38 UTC to 2019-07-13 01:15:17.38 UTC). In this case, we report a p-value of 1.0,
consistent with no significant excess of track-like events, and a corresponding time-integrated
muon-neutrino flux upper limit assuming an E^-2 spectrum (E^2 dN/dE) of
 1.6 x 10^-4 TeV cm^-2 at the 90% CL.

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.