Feature #604
Updated by Knödlseder Jürgen over 11 years ago
So that, the positions of point source cannot be fitted in the Fermi-LAT analysis. Fitting should be enabled.
There are two approaches, a fast and easy (but less precise approach) and an exact but slower approach.
The PSF for point sources are precomputed using the @GLATMeanPsf@ class. Formally, the content of @GLATMeanPsf@ depends on the precise position of the source, but if the position is only changed slightly, the content should not really change. We could this adopt the response class so that the actual position and the position for which @GLATMeanPsf@ was computed could differ. This is the fast and easy way.
The exact way would be to recompute the content of @GLATMeanPsf@ each time the position is changed. This takes some computing time, but maybe it's not so expensive at the end. At least, this method would be exact.
We could test both and compare the speeds and precisions.
There are two approaches, a fast and easy (but less precise approach) and an exact but slower approach.
The PSF for point sources are precomputed using the @GLATMeanPsf@ class. Formally, the content of @GLATMeanPsf@ depends on the precise position of the source, but if the position is only changed slightly, the content should not really change. We could this adopt the response class so that the actual position and the position for which @GLATMeanPsf@ was computed could differ. This is the fast and easy way.
The exact way would be to recompute the content of @GLATMeanPsf@ each time the position is changed. This takes some computing time, but maybe it's not so expensive at the end. At least, this method would be exact.
We could test both and compare the speeds and precisions.