# Rereview of the updated code on all gwtc3 MDR events
This review page is for checking posteriors on the reruns on O3 events. I have not heard anything from Naresh, so currently events are split 3 ways.
We have reviewed most of the events ourselves [here](https://git.ligo.org/tomasz.baka/liv-automation/-/wikis/GWTC3-event-review), so we expect the results to be OK, unless me missed something. The posterior railing checks performed there were automatic, but they sometimes give false negative, so need to be checked by eye. For A posteriors we focused on improvements over O3 results, but you should focus mostly on if new posteriors look OK.
Main things to consider during review:
- in summary pages look at `luminosity_distance` and `chirp_mass` posteriors. Note any railings or weird features (like double peaks)
- in A plot (or m_g plot) see if gr is recovered (A=0 has support in the posterior)
- take note if there are any weird features of the posterior (like double peaks)
- for positive alpha, results from o3b are overplotted. We expect our new results to be similar or better. If the posteriors look worse, take not of that
I suggest following key:
- if the posteriors look OK, mark the cell in the table with `:white_check_mark:` and leave no comment
- if there are some potential problems but you are not sure, mark it with `:neutral_face:` and comment on the issue you have with it
- if posteriors look wrong, mark it with `:x:` and comment what is wrong with it
Readability may affect the length of comments in the table. Feel free to write your comments below the table if you want more space.
