IceCube-220317A
GCN Circular 31762
Subject
IceCube-220317A - IceCube observation of a high-energy neutrino candidate track-like event
Date
2022-03-17T03:34:08Z (3 years ago)
From
Marcos Santander at U. Alabama/IceCube <jmsantander@ua.edu>
The IceCube Collaboration (http://icecube.wisc.edu/) reports:
On 2022-03-17 at 02:32:17.68 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 Bronze alerts is 30%. This alert has an estimated false alarm rate of 1.899 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/136441_11435033.amon), more sophisticated reconstruction algorithms have been applied offline, with the direction refined to:
Date: 2022-03-17
Time: 02:32:17.68 UT
RA: 155.74 (+2.23, -1.74 deg 90% PSF containment) J2000
Dec: 11.19 (+1.00, -1.39 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.
One gamma-ray source listed in the 4FGL-DR2 Fermi-LAT catalog is located within the 90% uncertainty region: 4FGL J1018.9+1043 (154.74 deg, 10.73 deg J2000, 1.08 deg away from the best-fit neutrino 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
GCN Circular 31764
Subject
IceCube-220317A: MASTER Global Robotic Net optical observations
Date
2022-03-17T19:12:15Z (3 years ago)
From
Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>
V.Lipunov, A.Kuznetsov, O.Gress,E.Gorbovskoy, N.Tyurina, P.Balanutsa, K.Zhirkov, A.Chasovnikov, D.Vlasenko, G.Antipov, V.Senik, D.Kuvshinov,
V.Topolev, Ya.Kechin, Yu.Tselik (Lomonosov Moscow State University, SAI, Physics Department),
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),
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 (ISU,API),
A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory),
A. Gabovich, V.Yurkov (Blagoveschensk Educational State University)
MASTER-OAFA robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy,
vol. 2010, 30L) located in Argentina (OAFA observatory of San Juan National University)
started inspect of the ICECUBE Alert 220317A (The IceCube Collaboration GCN 31762, trigger No 11435033,10h 22m 57.60s , +11d 11m 24.0s, R=1.59)errorbox
18 sec after notice time (90 sec after trigger time) at 2022-03-17 02:33:47 UT, with upper limit up to 14.4 mag.
The observations began at zenith distance = 44 deg. The sun altitude is -45.2 deg.
The distance to full Moon was 8 degrees (Lunar disk: 0.98).
MASTER-OAGH robotic telescope located in Mexico (OAGH National Institute for Astrophysics, Optics and Electronics) started inspect of the
ICECUBE-220317A alert errorbox 173 sec after notice time and 244 sec after trigger time at 2022-03-17 02:36:22 UT, with upper limit up to 16.4 mag.
Observations started at twilight at zenith distance = 52 deg. The sun altitude was -15.5 deg.
The galactic latitude b = 52 deg., longitude l = 231 deg.
Real time updated cover map is available here:
https://master.sai.msu.ru/site/master2/observ.php?id=1913174
We obtain a following upper limits at first images:
Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment
_________|_____________________|_____________________|____________________________________|_____|_______|_______|________
100 | 2022-03-17 02:33:47 | MASTER-OAFA | (10h 21m 41.33s , +12d 08m 25.8s) | C | 20 | 14.4 |
140 | 2022-03-17 02:34:27 | MASTER-OAFA | (10h 21m 41.73s , +12d 09m 27.3s) | C | 20 | 14.4 |
270 | 2022-03-17 02:36:22 | MASTER-OAGH | (10h 22m 01.10s , +10d 54m 38.4s) | P- | 50 | 13.4 |
437 | 2022-03-17 02:38:54 | MASTER-OAGH | (10h 22m 01.18s , +10d 53m 46.9s) | P- | 80 | 13.6 |
548 | 2022-03-17 02:40:35 | MASTER-OAGH | (10h 21m 58.29s , +10d 55m 03.7s) | P- | 100 | 14.0 |
679 | 2022-03-17 02:42:36 | MASTER-OAGH | (10h 21m 58.26s , +10d 53m 47.3s) | P- | 120 | 13.6 |
We didn't detect bright outburst of 4FGL J1018.9+1043 at wide-field alert images, but we detected
outburst in MASTER archive data at 2011-03-24 13:05:05UT with unfiltered m_BLA = 18.9m.
The analysis of wide-field and very wide field MASTER images and
observations will be continued.
Additional observations are planned.
GCN Circular 31767
Subject
IceCube-220317A: Upper limits from a search for additional neutrino events in IceCube
Date
2022-03-18T16:06:20Z (3 years ago)
From
Alex Pizzuto at ICECUBE/U of Wisconsin <pizzuto@wisc.edu>
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-220317A (https://gcn.gsfc.nasa.gov/gcn3/31762.gcn3) in a time range of 1000 seconds centered on the alert event time (2022-03-17 02:23:57.680 UTC to 2022-03-17 02:40:37.680 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-220317A. 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-220317A ranges 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 (2022-03-16 02:32:17.680 UTC to 2022-03-18 02:32:17.680 UTC). In this case, we report a p-value of 0.08, 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-220317A ranges from 1.5e-01 to 1.6e-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<mailto:roc@icecube.wisc.edu>.
[1] IceCube Collaboration, R. Abbasi et al., ApJ 910 4 (2021)
GCN Circular 31768
Subject
Fermi-LAT Gamma-ray Observations of IceCube-220317A
Date
2022-03-18T22:00:09Z (3 years ago)
From
Sara Buson at GSFC/Fermi <sara.buson@gmail.com>
S. Buson (Univ. of Wuerzburg) and S. Garrappa (DESY-Zeuthen) on behalf of the Fermi-LAT collaboration:
We report an analysis of observations of the vicinity of the high-energy IC-220317A neutrino event (GCN 31762) 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 2022-03-17 at 02:32:17.68 UT (T0) with J2000 position RA = 155.74 (+2.23, -1.74) deg, Decl. = 11.19 (+1.00, -1.39) deg (90% PSF containment). One cataloged gamma-ray (>100 MeV) source is located within the 90% IC-220317A localization region. This is 4FGL J1018.9+1043 (4FGL-DR3; arXiv:2201.11184; The Fermi-LAT collaboration 2020, ApJS, 247, 33), associated with the blazar of uncertain type WISEA J101857.98+103625.5. Based on a preliminary analysis of the LAT data over the timescales of 1-day and 1-month prior to T0, this object is not significantly detected (> 5 sigma).
We searched for intermediate (days to years) timescale emission from a new gamma-ray transient source. Preliminary analysis indicates no significant (> 5 sigma) new excess emission (> 100 MeV) at the IC-220317A best-fit position. Assuming a power-law spectrum (photon index = 2.0 fixed) for a point source at the IC-220317A best-fit position, the >100 MeV flux upper limit (95% confidence) is < 2.0e-10 ph cm^-2 s^-1 for ~13-years (2008-08-04 to 2022-03-17 UTC), and < 2.2e-8 (< 9.6e-8) 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 these observations the Fermi-LAT contact persons are S. Buson (sara.buson at uni-wuerzburg.de) and S. Garrappa (simone.garrappa at desy.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.