{
  "circularId": 45946,
  "submittedHow": "web",
  "submitter": "Yuhua Yao at  IceCube/UW-Madison <yyao255@icecube.wisc.edu>",
  "format": "text/plain",
  "eventId": "IceCube-261012A",
  "eventType": [
    "Neutrino"
  ],
  "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-261012A (https://gcn.nasa.gov/circulars/45929) in a time range of 1000 seconds centered on the alert event time (2026-10-12 16:49:51.460 UTC to 2026-10-12 17:06:31.460 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-261012A. We report a p-value of 1.00 in this time window. IceCube’s sensitivity to neutrino point sources with an E^-2.5 spectrum, expressed as E^2 dN/dE evaluated at 1 TeV, is 1.3e-01 GeV cm^-2 within the 90% spatial containment region of IceCube-261012A 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. \n\nA subsequent search was performed including 2 days of data centered on the alert event time (2026-10-11 16:58:11.460 UTC to 2026-10-13 16:58:11.460 UTC). In this case, we report a p-value of 1.00, consistent with no significant excess of track events. IceCube’s sensitivity to neutrino point sources with an E^-2.5 spectrum, expressed as E^2 dN/dE evaluated at 1 TeV, is 1.5e-01 GeV cm^-2 within the 90% spatial containment region of IceCube-261012A in a 2 day\ntime 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)\n",
  "subject": "IceCube-261012A: Upper limits from a search for additional neutrino events in IceCube",
  "createdOn": 1791924488934
}