STARITHM
Fermi GBM detected a Terrestrial Gamma-ray Flash (TGF) on 2026-10-16
AI Summary
Fermi GBM triggered on event 813850860 at 2026-10-16T13:40:55.29Z with a classification of Terrestrial Gamma-ray Flash (TGF) at 100% confidence. The burst had a duration of 0.016-0.032 seconds with a significance of 3.3-9 sigma and intensity of 299 counts. TGFs are non-astrophysical phenomena originating from Earth's atmosphere, not cosmological sources, resulting in low scientific significance for transient astrophysics follow-up.
Measurements
| Event ID | 813850860 |
|---|---|
| Source | Fermi GBM |
| Alert type | GRB |
| Significance | low |
| Trigger time (UTC) | Fri, 16 Oct 2026 13:40:55 GMT |
| Right ascension (J2000) | 272.0667° |
| Declination (J2000) | 27.8333° |
| Position error radius | 20.3° |
| GCN notices | 2 |
| GCN circulars | 0 |
Notices (1)
Fermi GBM — GRB · Fri, 16 Oct 2026 13:40:55 GMT
AI summary generated Fri, 16 Oct 2026 17:28:56 GMT.