GCN Circular 33955

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 230610A (https://gcn.gsfc.nasa.gov/notices_amon_icecube_cnascade/138035_55730330.amon<https://gcn.gsfc.nasa.gov/notices_amon_icecube_cascade/138035_55730330.amon>)

in a time range of 1000 seconds centered on the alert event time (2023-06-10 23:51:15.570 UTC to 2023-06-11 00:07:55.570 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 230610A. 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 230610A ranges from 1.3e-01 to 2.1e+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 2e+02 GeV and 1e+06 GeV.


A subsequent search was performed including 2 days of data centered on the alert event time (2023-06-09 23:59:35.570 UTC to 2023-06-11 23:59:35.570 UTC). In this case, we report a p-value of 0.83, 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 230610A ranges from 1.5e-01 to 2.0e+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<mailto:roc@icecube.wisc.edu>.


[1] IceCube Collaboration, R. Abbasi  et al., ApJ 910 4 (2021)