{
  "version": 2,
  "eventId": "EP250108a",
  "submitter": "Jessie Thwaites at IceCube/U Wisc-Madison <thwaites@wisc.edu>",
  "createdOn": 1738336559932,
  "circularId": 39108,
  "submittedHow": "web",
  "body": "The IceCube Collaboration (http://icecube.wisc.edu/) reports:\n\nIceCube has performed a search for track-like muon neutrino events arriving from the direction of the FBOT EP250108A in a time window of [-600, +5000] seconds from the initial trigger reported by Einstein Probe (GCN 38861), during which time IceCube was collecting good quality data (2025-01-08 12:20:28.34 UTC to 2025-01-08 13:53:48.34 UTC). Zero track-like events are found coincident with the position of the FBOT. We accordingly derive a time-integrated muon-neutrino flux upper limit for this source of E^2 dN/ dE = 0.29 GeV cm^-2 at 90% CL, under the assumption of an E^-2 power law. 90% of events IceCube would detect from a source at this declination with an E^-2 spectrum have energies in the approximate energy range between 60 TeV and 20 PeV.\n\nA subsequent search was performed with a time window of [-2, +12] days with respect to the initial trigger (2025-01-06 12:30:28.34 UTC to 2025-01-20 12:30:28.34 UTC). In this case, we report a p-value of 1.0, consistent with background expectation. We accordingly derive a time-integrated muon-neutrino flux upper limit for this source of E^2 dN/ dE = 0.34 GeV cm^-2 at 90% CL, under the assumption of an E^-2 power law. \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",
  "editedOn": 1769437364280,
  "format": "text/plain",
  "bibcode": "2025GCN.39108....1I",
  "subject": "EP250108A / SN 2025kg: Upper limits from a neutrino search with IceCube",
  "editedBy": "Judith Racusin at NASA/GSFC <judith.racusin@nasa.gov> on behalf of Malte Busmann at Ludwig-Maximilians-Universität München <m.busmann@physik.lmu.de>"
}