Skip to main content
Testing. You are viewing the public testing version of GCN. For the production version, go to https://gcn.nasa.gov.
New Announcement Feature, Code of Conduct, Circular Revisions. See news and announcements

GCN Circular 33219

Subject
IceCube-230122A: Upper limits from a search for additional neutrino events in IceCube
Date
2023-01-24T21:47:19Z (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-230122A (https://gcn.gsfc.nasa.gov/gcn3/33204.gcn3) in a time range of 1000 seconds centered on the alert event time (2023-01-22 03:41:42.000 UTC to 2023-01-22 03:58:22.000 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-230122A. 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-230122A ranges from 1.3e-01 to 1.4e-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 (2023-01-21 03:50:02.000 UTC to 2023-01-23 03:50:02.000 UTC). In this case, we report a p-value of 0.17, 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-230122A 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.
Looking for U.S. government information and services? Visit USA.gov