background¶
-
gammapy.stats.background(n_off, alpha)[source]¶ Estimate background in the on-region from an off-region observation.
\[\mu_{background} = \alpha \times n_{off}\]- Parameters
- n_offarray_like
Observed number of counts in the off region
- alphaarray_like
On / off region exposure ratio for background events
- Returns
- background
numpy.ndarray Background estimate for the on region
- background
Examples
>>> background(n_off=4, alpha=0.1) 0.4 >>> background(n_off=9, alpha=0.2) 1.8