Feature #604

Allow fitting for point source positions in Fermi-LAT analysis

Added by Knödlseder Jürgen over 11 years ago. Updated over 6 years ago.

Status:ClosedStart date:
Priority:NormalDue date:
Assigned To:Knödlseder Jürgen% Done:

100%

Category:-
Target version:1.5.0
Duration:

Description

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.

Recurrence

No recurrence.

Related issues

Related to ctools - Bug #2183: All pixels have the same TS value for Fermi-LAT analysis ... Closed 08/26/2017

History

#1 Updated by Knödlseder Jürgen over 11 years ago

  • Subject changed from Allow fitting for point sources in Fermi-LAT analysis to Allow fitting for point source positions in Fermi-LAT analysis
  • Description updated (diff)

#2 Updated by Knödlseder Jürgen almost 8 years ago

  • Target version set to 1.2.0

#3 Updated by Knödlseder Jürgen about 7 years ago

  • Target version changed from 1.2.0 to 1.3.0

#4 Updated by Knödlseder Jürgen almost 7 years ago

  • Target version deleted (1.3.0)

#5 Updated by Knödlseder Jürgen over 6 years ago

  • Related to Bug #2183: All pixels have the same TS value for Fermi-LAT analysis using cttsmap added

#6 Updated by Knödlseder Jürgen over 6 years ago

  • Status changed from New to Closed
  • Assigned To set to Knödlseder Jürgen
  • Target version set to 1.5.0
  • % Done changed from 0 to 100

This is at the end a duplication of #2183. I therefore close this issue since #2183 is about to be closed.

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