GCN Circular 39943
Subject
IceCube-250330A - IceCube observation of a high-energy neutrino candidate track-like event
Date
2025-03-30T11:02:08Z (19 days ago)
Edited On
2025-03-31T02:03:01Z (19 days ago)
From
Giacomo Sommani at Ruhr-Universität Bochum <gsommani@icecube.wisc.edu>
Edited By
Vidushi Sharma at NASA GSFC/UMBC <vidushi.sharma@nasa.gov> on behalf of Giacomo Sommani at Ruhr-Universität Bochum <gsommani@icecube.wisc.edu>
Via
Web form
The IceCube Collaboration (http://icecube.wisc.edu/) reports:
On 2025-03-30 08:31:06.33 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 1.7612 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/140729_49427574.amon), more sophisticated reconstruction algorithms have been applied offline, with the direction refined to:
Date: 2025-03-30
Time: 08:31:06.33 UT
RA: 307.53 (+0.57, -0.47 deg 90% PSF containment) J2000
Dec: 11.07 (+0.45, -0.47 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.
No known gamma-ray sources listed in the Fermi 4FGL-DR4 or 3FHL catalogs are located within the 90% uncertainty region of the event.
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