Credible regions and galaxies query using Aladin
It could be useful to add a section about the creation of the "MOC credible regions" and galaxy catalog queries using Aladin sky Atlas as shown in the Gravitational Wave Open Data Workshop here - https://github.com/gw-odw/odw-2019/blob/master/Day_2/Tuto%202.6%20Working_with_gravitational_wave_skymaps.ipynb