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Use info of previous preferred external event to help pick new one; fixes #518

Brandon Piotrzkowski requested to merge brandon.piotrzkowski/gwcelery:not-grb-preferred into main

This MR adds additional conditions to whether the preferred external event (the one being quoted in the alert) should be updated to another external event, which includes:

  • Update if old preferred external event was likely not real (has 'NOT_GRB' label) while the real one is real (lack of 'NOT_GRB' label), superseding the normal joint FAR check. Also prevent the reverse case from updating the coinc FAR.
  • Don't update if the old preferred external event was from SNEWS and the new one is not
Edited by Brandon Piotrzkowski

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