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Table 2.
Estimation of the systematic effects associated with the Fermi-LAT analysis.
| Type | Range explored | Change in  |
Change in the total flux |
|---|---|---|---|
| Diffuse background | Alternative models | 20% | 40% |
| Energy threshold (⋆) | 100−500 MeV | 6.3% | 63% |
| Energy binning | 5−12 bin per decade | 2.9% | 5.5% |
| Spatial binning | 0.05−0.2 deg pix−1 | 1.9% | 0.9% |
| ROI size | 8−15° | 0.9% | 12.8% |
| 4FGL source selection size | 20−30° | 0.8% | 1.8% |
| Event selection | Alternative selections | 6.3% | 12.8% |
| Rocking angle cut | Yes/No | 3.5% | 3.6% |
Notes. (⋆)The flux variation is computed by extrapolating the model in the range 200 MeV−300 GeV. The flux uncertainty is largely driven by uncertainties in the extrapolation.
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