{
  "bibcode": "2025GCN.38799....1I",
  "format": "text/plain",
  "subject": "IceCube-250101A: Upper limits from a search for additional neutrino events in IceCube",
  "circularId": 38799,
  "eventId": "IceCube-250101A",
  "submitter": "Jessie Thwaites at IceCube/U Wisc-Madison <thwaites@wisc.edu>",
  "body": "The IceCube Collaboration (http://icecube.wisc.edu/) reports:\n\nIceCube has performed a search [1] for additional track-like muon neutrino events arriving from the direction of IceCube-250101A (https://gcn.nasa.gov/circulars/38770) in a time range of 1000 seconds centered on the alert event time (2025-01-01 20:56:37.730 UTC to 2025-01-01 21:13:17.730 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-250101A. 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-250101A is 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. \n\nA subsequent search was performed including 2 days of data centered on the alert event time (2024-12-31 21:04:57.730 UTC to 2025-01-02 21:04:57.730 UTC). In this case, we report a p-value of 1.00, 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-250101A is 1.6e-01 GeV cm^-2 in a 2 day time window. \n\nThe 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.\n\n[1] IceCube Collaboration, R. Abbasi  et al., ApJ 910 4 (2021)",
  "createdOn": 1735922346237,
  "submittedHow": "web"
}