Skip to main content
Testing. You are viewing the public testing version of GCN. For the production version, go to
New Announcement Feature, Code of Conduct, Circular Revisions. See news and announcements

GCN Circular 24988

IceCube-190704A: Upper limits from a search for additional neutrino events in IceCube
2019-07-05T21:39:40Z (5 years ago)
Alex Pizzuto at ICECUBE/U of Wisconsin <>
The IceCube Collaboration ( reports:

IceCube has performed a search for additional track-like muon neutrino events arriving
from the direction of IceCube-190704A ( in a time
range of 2 days centered on the alert event time (2019-07-03 18:48:52.25 UTC to 2019-07-05 18:48:52.25 UTC) during which IceCube was collecting good quality data. Excluding the
event that prompted the alert, one additional track-like event is found in spatial coincidence
with the 90% point spread function containment of IceCube-190704A. 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 at the alert position assuming an E^-2 spectrum (E^2
dN/dE) at the 90% CL of 5.1 x 10^-5 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
approximately between 1 TeV and 1 PeV.

A subsequent search was performed to include the previous month of data (2019-06-04 18:48:52.25 UTC to 2019-07-05 18:48:52.25 UTC). In this case, we report a p-value of 1.0,
consistent with no significant excess of track-like events, and a corresponding time-integrated
muon-neutrino flux upper limit assuming an E^-2 spectrum (E^2 dN/dE) of
 1.4 x 10^-4 TeV cm^-2 at the 90% CL.

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<>.
Looking for U.S. government information and services? Visit