IceCube-230725A: Upper limits from a search for additional neutrino events in IceCube
Abstract
IceCube has performed a search [1] for additional track-like muon neutrino events arriving from the direction of IceCube-230725A (https://gcn.nasa.gov/circulars/34261) in a time range of 1000 seconds centered on the alert event time (2023-07-25 21:22:31.060 UTC to 2023-07-25 21:39:11.060 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-230725A. 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-230725A is 1.3e-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 (2023-07-24 21:30:51.060 UTC to 2023-07-26 21:30:51.060 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-230725A 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. [1] IceCube Collaboration, R. Abbasi et al., ApJ 910 4 (2021)
- Publication:
-
GRB Coordinates Network
- Pub Date:
- July 2023
- Bibcode:
- 2023GCN.34274....1I