Fermi GBM detects a Terrestrial Gamma-ray Flash (TGF) with high confidence.
AI Summary
The event triggered on 2026-07-18 at 20:34:33.90Z and was classified as a TGF with 100% probability. Key measurements indicate it originated from the Earth's atmosphere, with no follow-up observations reported.
Measurements
| Event ID | 806099678 |
|---|---|
| Source | Fermi GBM |
| Alert type | GRB |
| Significance | low |
| Trigger time (UTC) | Sat, 18 Jul 2026 20:34:33 GMT |
| Right ascension (J2000) | 200.7167° |
| Declination (J2000) | 55.5667° |
| Position error radius | 28.2° |
| GCN notices | 2 |
| GCN circulars | 0 |
Notices (1)
Fermi GBM — GRB · Sat, 18 Jul 2026 20:34:33 GMT
AI summary generated Thu, 23 Jul 2026 14:28:00 GMT.