[vsnet-grb-info 26110] IceCube-200806A: IceCube observation of a high-energy neutrino candidate event

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  28210
SUBJECT: IceCube-200806A: IceCube observation of a high-energy neutrino candidate event
DATE:    20/08/06 15:46:44 GMT
FROM:    Robert Stein at DESY  <robert.stein at desy.de>

The IceCube Collaboration (http://icecube.wisc.edu/) reports:

On 20/08/06 at 13:50:56.43 UT IceCube detected a track-like event with a moderate probability of being of astrophysical origin. The event was selected by the ICECUBE_Astrotrack_Bronze alert stream.  The average astrophysical neutrino purity for Bronze alerts is 30%. This alert has an estimated false alarm rate of 0.792 events per year due to atmospheric backgrounds. The IceCube detector was in a normal operating state at the time of detection. 

After the initial automated alert (https://gcn.gsfc.nasa.gov/notices_amon_g_b/134354_59221243.amon <https://gcn.gsfc.nasa.gov/notices_amon_g_b/134354_59221243.amon>), more 
sophisticated reconstruction algorithms have been applied offline, with the direction refined to:

Date: 20/08/06
Time: 13:50:56.43  UT
RA: 157.25 (+1.21 -0.89 deg 90% PSF containment) J2000
Dec:  47.75 (+0.65 -0.64 deg 90% PSF containment) J2000

We encourage follow-up by ground and space-based instruments to help identify a possible astrophysical source for the candidate neutrino.

There are no Fermi 4FGL sources located within the 90% localization region. The nearest gamma-ray source is 4FGL J1015.0+4926, located at RA: 153.77 deg, Dec: 49.43 deg (2.85 deg away from the best-fit event position).

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 at icecube.wisc.edu <mailto:roc at icecube.wisc.edu>