Update of post_DL3_analysis notebook

[moralejo]

A bit of clean-up.
Made the Content Summary consistent with the actual contents.
Changed excess vs. sqrt(t) to excess vs. t (which is what is meaningful for a steady flux).
Moved all the light curve calculations after the SED ones. It is not needed to re-do everything just to change the light curve energy range.

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 73.50%. Comparing base (e097079) to head (c029ec7).
Report is 181 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1262      +/-   ##
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+ Coverage   73.05%   73.50%   +0.45%     
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  Files         134      134              
  Lines       14039    14211     +172     
==========================================
+ Hits        10256    10446     +190     
+ Misses       3783     3765      -18     

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[moralejo]

This has been tested with the 2024 LST analysis school Crab data under /fefs/aswg/workspace/analysis-school-2024/DL3/Crab_Dec_2023

[morcuended]

I'll implement the comments

[moralejo]

@morcuended did you do those changes? Were they related to the changes I introduced, or just general improvements of the notebook? (if the latter they should be in another PR for clarity)

[morcuended]

I have to go through it again. I will probably do the changes in another PR to not keep this pending forever

[morcuended]

I made the pending modifications. Sorry for taking so long. Further improvements and updates can be done in other PRs. I also updated DL3 files to be able to use Gammapy 1.2

[chaimain]

Looks good. In the next changes, I would suggest replacing the mention of OGIP files and simply use the standard method used in Gammapy to write DL4/5files (with the gadf format)

Edit: Also Gammapy allows getting the pivot energy for any spectral model. Perhaps it is better to also mention the example in Gammapy to get EBL-deabsorbed spectra

[morcuended]

Looks good. In the next changes, I would suggest replacing the mention of OGIP files and simply use the standard method used in Gammapy to write DL4/5files (with the gadf format)

Edit: Also Gammapy allows getting the pivot energy for any spectral model. Perhaps it is better to also mention the example in Gammapy to get EBL-deabsorbed spectra

Yes, but I think that can be updated later. The EBL de-absorbed will be for 1.3. The pivot energy for any spectral model can be done already with 1.2.

I opened an issue (#1315) to list all these points. Plus those you told me some time ago.