{
  "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-250905A (https://gcn.nasa.gov/circulars/41731) in a time range of 1000 seconds centered on the alert event time (2025-09-05 20:00:16.000 UTC to 2025-09-05 20:16:56.000 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-250905A.We report a p-value of 1.00 in this time window. 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-250905A 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 2e+02 GeV and 6e+04 GeV. \n\nA subsequent search was performed including 2 days of data centered on the alert event time (2025-09-04 20:08:36.000 UTC to 2025-09-06 20:08:36.000 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-250905A ranges from 1.7e-01 to 1.8e-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 \nbe reached at roc@icecube.wisc.edu.\n\n[1] IceCube Collaboration, R. Abbasi  et al., ApJ 910 4 (2021)\n\n",
  "format": "text/plain",
  "bibcode": "2025GCN.41744....1I",
  "submittedHow": "web",
  "circularId": 41744,
  "createdOn": 1757217085002,
  "eventId": "IceCube-250905A",
  "submitter": "Yuhua Yao at  IceCube/UW-Madison <yyao255@icecube.wisc.edu>",
  "subject": "IceCube-250905A: Upper limits from a search for additional neutrino events in IceCube"
}