STARITHM
Fermi GBM trigger 812885202: Ambiguous gamma-ray burst classification with conflicting alerts
AI Summary
Fermi GBM detected a gamma-ray transient on 2026-10-05 at 09:26:37 UTC with trigger ID 812885202. The initial alert (packet type 110) reported a 5-sigma detection over 4.096 seconds with energy range 47–291 keV. Subsequent position notices show conflicting classifications: one alert classified the event as 'BeginningOfFile' (100% confidence), while another classified it as AGN (80% confidence) with SolarFlare as secondary candidate (13%). The event was localized to two different sky positions with large positional uncertainties (50° and ~18°), suggesting either instrumental artifacts or genuine source confusion. No follow-up circulars have been issued, and the conflicting machine classifications warrant caution in interpretation.
Measurements
| Event ID | 812885202 |
|---|---|
| Source | Fermi GBM |
| Alert type | GRB |
| Significance | medium |
| Trigger time (UTC) | Mon, 05 Oct 2026 09:26:37 GMT |
| Right ascension (J2000) | 315.4833° |
| Declination (J2000) | 80.2833° |
| Position error radius | 50° |
| GCN notices | 3 |
| GCN circulars | 0 |
Notices (1)
Fermi GBM — GRB · Mon, 05 Oct 2026 09:26:37 GMT
AI summary generated Mon, 05 Oct 2026 14:27:09 GMT.