Open Access
Table 1
Comparison of energy thresholds in Fermi-LAT analyses.
| Energy threshold | PSF (68% containment) | Relative count rate (normalized to 1 GeV) | Primary use case |
|---|---|---|---|
| 0.1 GeV | ~5.0° | Very high (10×) | Diffuse emission studies |
| 1.0 GeV | ~0.8° | Reference (1×) | General source detection |
| 3.0 GeV | ~0.3° | Moderate (0.4×) | Crowded field analysis |
| 10.0 GeV | <0.1° | Low (0.1×) | Point source localization |
Notes. PSF values represent 68% containment radii for combined front+back converting events, averaged over incidence angles (SLAC National Accelerator Laboratory n.d.).
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