Update of the 1D analysis tutorial

[bkhelifi]

The 1D tutorial can be updated with the latest developments.

Indeed, the dataset serialisation uses a manual loop. One might also use `gammapy.stats.utils.ts_to_sigma'.

[ccossou]

I'm trying to get a sensitivity using the following tutorial: https://docs.gammapy.org/dev/tutorials/analysis-1d/cta_sensitivity.html?highlight=sensitivity

While I was going to submit an issue, I've found this one and I think what I'm struggling with is part of "1D analysis tutorial". So I refrained from creating a new issue, but can if it turns out they are unrelated.

My issues are:

• When trying to test the notebook, I used Binder and it crashed. First at around step Step 28/55, with the error:

  ---> Removed intermediate container c95c1aef4bc9
  ---> 23137b9ed55d
  Step 28/55 : RUN mkdir -p ${NPM_DIR} && chown -R ${NB_USER}:${NB_USER} ${NPM_DIR}
  ---> Running in 361a9d1a2ade
  ---> Removed intermediate container 361a9d1a2ade
  failed to get digest sha256:23137b9ed55dd943ae35621253218b001d266f683fcf560eea49105ba933abe8: open /var/lib/docker/image/overlay2/imagedb/content/sha256/23137b9ed55dd943ae35621253218b001d266f683fcf560eea49105ba933abe8: no such file or directory

  then, when I tried again before submitting this issue, I got:

  Step 41/55 : USER root
  No such image: sha256:1e4312d961662793af27da856635b93e8450eef97dc69948f2d3a20413e5c043

• I then tried to run the code locally. When running the command

  File "/local/home/ccossou/anaconda3/envs/ctabench/lib/python3.10/site-packages/gammapy/data/event_list.py", line 8, in <module>
  from astropy.coordinates.angle_utilities import angular_separation
  ModuleNotFoundError: No module named 'astropy.coordinates.angle_utilities'

  To install gammapy, I just did pip install gammapy I have gammapy v1.1, astropy 6.0.0 and python 3.10

[AtreyeeS]

@ccossou Your issue is probably unrelated to the docs improvement proposed here. Gammapy 1.1 is not compatible with astropy 6.0. The best way to set it up would be to use conda, see here https://docs.gammapy.org/1.1/getting-started/index.html#quickstart-setup You may also update to Gammapy v1.2 which is compatible with the latest astropy version