Astronomy and Astrophysics – Astrophysics – Instrumentation and Methods for Astrophysics
Scientific paper
2012-03-26
Astronomy and Astrophysics
Astrophysics
Instrumentation and Methods for Astrophysics
17 pages, 6 figures
Scientific paper
The applicability of combined source analyses to atmospheric Cherenkov telescope observations is investigated. In particular, the effect of systematic uncertainties affecting the relative normalisation of fiducial ON and OFF-source sampling regions - often denoted as {\alpha} - is examined. The traditional summation of accumulated ON and OFF-source event counts is found to perform sub-optimally in the studied contexts and requires careful calibration to correct for unexpected and potentially misleading statistical behaviour. An alternative joint likelihood technique is introduced, which is designed to treat systematic uncertainties in a uniform and statistically robust manner. This alternate method is shown to yield dramatically enhanced performance and reliability with respect to the more traditional approach.
Conrad Jan
Dickinson Hugh
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