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GCN Circular 33548

Subject
IceCube-Cascade 230329A: Upper limits from a search for additional neutrino events in IceCube
Date
2023-03-31T15:37:30Z (a year 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-Cascade 230329A (https://gcn.gsfc.nasa.gov/notices_amon_icecube_cascade/137786_1524801.amon) in a time range of 1000 seconds centered on the alert event time (2023-03-29 20:21:48.310 UTC to 2023-03-29 20:38:28.310 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-Cascade 230329A. 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-Cascade 230329A ranges from 1.0e+01 to 1.9e+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 4e+04 GeV and 4e+06 GeV.

A subsequent search was performed including 2 days of data centered on the alert event time (2023-03-28 20:30:08.310 UTC to 2023-03-30 20:30:08.310 UTC). In this case, we report a p-value of 0.89, 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-Cascade 230329A ranges from 1.0e+01 to 1.9e+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)
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