STARITHM
High-energy neutrino detected by IceCube with potential gamma-ray counterpart
AI Summary
IceCube observed a high-energy neutrino event (IceCube-260916A) on 2026-09-16, followed by a gamma-ray excess detected by Fermi-LAT near the neutrino's location, suggesting a possible astrophysical origin.
Measurements
| Event | IceCube-260916A |
|---|---|
| Event ID | IceCube-260916A |
| Source | IceCube |
| Alert type | NEUTRINO |
| Significance | high |
| Trigger time (UTC) | Wed, 16 Sep 2026 17:33:51 GMT |
| Right ascension (J2000) | 156.18° |
| Declination (J2000) | 4.22° |
| Position error radius | 0.48° (28.8′) |
| Position from | notice icecube.gold_bronze_track_alerts |
| GCN notices | 2 |
| GCN circulars | 3 |
Every localisation reported in Circulars (1)
| Instrument | Of | Error | Circular |
|---|---|---|---|
| IceCube | burst | 30.6′ (90%) | GCN 45598 |
Observations (3)
Values parsed from the Circular text; each row names its Circular.
| Time since trigger | Band | Value | Telescope | Circular |
|---|---|---|---|---|
| T+24.0 h | >100 MeV | < 2.40e-7 ph cm^-2 s^-1 (limit) | Fermi | GCN 45705 |
| T+31.0 d | >100 MeV | < 9.30e-8 ph cm^-2 s^-1 (limit) | Fermi | GCN 45705 |
| — | 100 MeV - 1 TeV | 1.40e-9 ± 8e-10 ph cm^-2 s^-1 | Fermi | GCN 45705 |
Notices (1)
IceCube — NEUTRINO · Wed, 16 Sep 2026 17:33:51 GMT
GCN Circulars (3)
GCN-45705 — IceCube-260916A
· Wed, 23 Sep 2026 14:36:28 GMT
The Fermi-LAT collaboration reported a 5.0 sigma gamma-ray excess, Fermi J1026+0359, near the high-energy neutrino event IC260916A detected by IceCube. This excess is likely associated with the blazar 3HSP J102523.0+040229, and regular monitoring of this source will continue.
GCN-45615 — IceCube-260916A
· Thu, 17 Sep 2026 18:18:12 GMT
nap
GCN-45598 — IceCube-260916A
· Wed, 16 Sep 2026 19:30:30 GMT
On September 26, 2016, the IceCube Neutrino Observatory detected a high-energy neutrino candidate event with a moderate probability of being of astrophysical origin. The event, designated IceCube-260916A, was detected at 17:33:51.90 UT and had an estimated false alarm rate of 3.8028 events per year due to atmospheric backgrounds.
AI summary generated Thu, 29 Oct 2026 22:48:47 GMT.