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background

gammapy.stats.background(n_off, alpha)

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

backgroundnumpy.ndarray

Background estimate for the on region

Examples

>>>

>>> background(n_off=4, alpha=0.1)
0.4
>>> background(n_off=9, alpha=0.2)
1.8