GCN Circular 24039
Subject
Search for additional neutrino events from the direction of IceCube-190331A with IceCube
Date
2019-04-01T16:26:27Z (5 years ago)
From
Alex Pizzuto at ICECUBE/U of Wisconsin <pizzuto@wisc.edu>
The IceCube Collaboration (http://icecube.wisc.edu/) reports:
IceCube has performed a search for additional track-like muon neutrino events arriving
from the direction of IceCube-190331A (https://gcn.gsfc.nasa.gov/gcn3/24028.gcn3) in a time
range of 2 days centered on the alert event time (2019-03-30 06:55:43.44 UTC to 2019-04-01
06:55:43.44 UTC) during which IceCube was collecting good quality data. Excluding the
event that prompted the alert, zero additional track-like events are found in spatial coincidence
with the 90% PSF containment of IceCube-190331A. We find that these data are well described
by atmospheric background expectations, with a p-value of 1.0. Accordingly, these data would
represent a time-integrated muon-neutrino flux upper limit assuming an E^-2 spectrum (E^2
dN/dE) at the 90% CL of 3.0 x 10^-4 TeV cm^-2 for this observation period. 90% of events
IceCube would detect from a source at this declination with an E^-2 spectrum are between
approximately 10 TeV and 1 PeV.
A subsequent search was performed to include the previous month of data (2019-03-01 06:55:43.44 UTC to 2019-04-01 06:55:43.44 UTC). In this case, we also report a p-value of 1.0,
consistent with no significant excess of track events, and a corresponding time-integrated
muon-neutrino flux upper limit assuming an E^-2 spectrum (E^2 dN/dE) at the 90% CL of
3.8 x 10^-4 TeV cm^-2.
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<mailto:roc@icecube.wisc.edu>