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GCN Circular 32564

Subject
IceCube-220918A: Upper limits from a search for additional neutrino events in IceCube
Date
2022-09-19T14:48:29Z (2 years ago)
From
Jessie Thwaites at IceCube/U Wisc-Madison <thwaites@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-220918A (https://gcn.gsfc.nasa.gov/gcn/gcn3/32562.gcn3) in a time range of 1000 seconds centered on the alert event time (2022-09-18 12:37:45.320 UTC to 2022-09-18 12:54:25.320 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-220918A. 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-220918A ranges from 1.3e-01 to 1.5e-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 3e+02 GeV and 2e+05 GeV.


A subsequent search was performed including 2 days of data centered on the alert event time (2022-09-17 12:46:05.320 UTC to 2022-09-19 12:46:05.320 UTC). In this case, we report a p-value of 0.03, 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-220918A 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)
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