Another Possible Mass-Gap Event ?

Note that if you scroll down and click on Full Superevent Log you will see other related entries for this discovery. The very top entry ( #178 ) has a clickable link ie.  S190930s-2-Initial.xml. If you open that in your browser, then scroll down through lots of info, especially this one ( my emphases ) :
<Param name="MassGap" dataType="float" value="0.950760658544" ucd="stat.probability">
<Description>
Probability that the source has at least one object between 3 and 5 solar masses
</Description>
</Param> 
It seems this is a useful file type to examine. Entry #105 has within it : S190930s-1-Preliminary.xml, containing

<Param name="FAR" dataType="float" value="3.00830365466e-09" ucd="arith.rate;stat.falsealarm" unit="Hz"><Description>

False alarm rate for GW candidates with this strength or greater
</Description>
</Param>

ie. a risk of approx 3 parts in one billion that this is not a true GW event.

Cheers, Mike.
 
(edit) You can also see the timeline of the log entries, these are all generated within 10 minutes. And I guess 'public' really means other astronomers too .... this is real-time astronomy.
 
(edit) Also by looking at the <Description> tags one can deduce what the limits are for categorisation :
Probability that the source is a binary neutron star merger (both objects lighter than 3 solar masses)
Probability that the source is a neutron star-black hole merger (primary heavier than 5 solar masses, secondary lighter than 3 solar masses)
Probability that the source is a binary black hole merger (both objects heavier than 5 solar masses)
Probability that the source has at least one object between 3 and 5 solar masses