Fermi GBM detects a likely Terrestrial Gamma-ray Flash (TGF) with high confidence
AI Summary
The Fermi Gamma-ray Burst Monitor detected an event classified as a Terrestrial Gamma-ray Flash (TGF) with 100% probability, indicating a non-astrophysical origin. The burst's energy range and significance suggest it originated from within Earth's atmosphere rather than space.
Measurements
| Event ID | 808613221 |
|---|---|
| Source | Fermi GBM |
| Alert type | GRB |
| Significance | low |
| Trigger time (UTC) | Sun, 16 Aug 2026 22:46:56 GMT |
| Right ascension (J2000) | 194.9667° |
| Declination (J2000) | -14.2167° |
| Position error radius | 30.6667° |
| GCN notices | 2 |
| GCN circulars | 0 |
Notices (1)
Fermi GBM — GRB · Sun, 16 Aug 2026 22:46:56 GMT
AI summary generated Sun, 16 Aug 2026 23:51:39 GMT.