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GCN Circular 36780

Subject
IceCube-Cascade 240626A: Upper limits from a search for additional neutrino events in IceCube
Date
2024-06-28T20:11:21Z (15 days ago)
From
Jessie Thwaites at IceCube/U Wisc-Madison <thwaites@wisc.edu>
Via
Web form
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 240626A (https://gcn.gsfc.nasa.gov/notices_amon_icecube_cascade/139582_13078951.amon) in a time range of 1000 seconds centered on the alert event time (2024-06-26 04:28:15.63 UTC to 2024-06-26 04:44:55.63 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 240626A. 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 240626A ranges from 1.4e-01 to 9.3e+00 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 3e+06 GeV. 

A subsequent search was performed including 2 days of data centered on the alert event time (2024-06-25 04:36:35.63 UTC to 2024-06-27 04:36:35.63 UTC). In this case, we report a p-value of 0.21, 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 240626A ranges from 1.6e-01 to 9.3e+00 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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