Bug #1870

TS value of large components

Added by Mayer Michael about 8 years ago. Updated over 7 years ago.

Status:NewStart date:10/06/2016
Priority:NormalDue date:
Assigned To:-% Done:

0%

Category:-
Target version:-
Duration:

Description

I recently made the test in simulating a few hundred hours of HESS data (only background) and analysing them with background and a large source in the FoV. Weirdly, the large component yields a TS value around ~100 for the unbinned analysis and ~10 for the stacked analysis. I hope to be able to provide a test case for CTA as well.

Recurrence

No recurrence.

History

#1 Updated by Knödlseder Jürgen about 8 years ago

  • Target version set to 1.2.0

#2 Updated by Knödlseder Jürgen about 8 years ago

A test case would indeed be good. I guess large means spatially large? How large was the component?

Maybe some issue with the Npred computation.

Did the ctlike fit converge easily or does the log file indicate issues?

#3 Updated by Mayer Michael about 8 years ago

The component was about half the size of the FoV (maybe even extending across and the log-file didnt indicate any issues (no warnings whatsoever). I will try to reproduce this problem with a similar set of pointings for CTA IRFs. Then we might be able to track it down more easily.

#4 Updated by Knödlseder Jürgen about 8 years ago

Mayer Michael wrote:

The component was about half the size of the FoV (maybe even extending across and the log-file didnt indicate any issues (no warnings whatsoever). I will try to reproduce this problem with a similar set of pointings for CTA IRFs. Then we might be able to track it down more easily.

I was wondering how the ctlike fit went. Did the fit stall? Or had any other convergence issues? How many iterations did you need?

#5 Updated by Knödlseder Jürgen almost 8 years ago

  • Target version changed from 1.2.0 to 1.3.0

#6 Updated by Knödlseder Jürgen over 7 years ago

  • Target version changed from 1.3.0 to 1.4.0

#7 Updated by Knödlseder Jürgen over 7 years ago

  • Target version deleted (1.4.0)

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