Update circulars for superevents
There are lots of assumptions that are broken by superevents:
-
We have to use ligo.gracedb.rest.GraceDb.superevent()
instead ofligo.gracedb.rest.GraceDb.event()
to query basic event properties like GPS time. -
We need to descend into the preferred event to determine things like the search group, pipeline, etc. -
The GraceDb event URLs are now different.