Another Possible Mass-Gap Event ?

Mike Hewson
Mike Hewson
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Topic 219697

Per the public log just a few days ago : https://gracedb.ligo.org/superevents/S190930s/view/.

Cheers, Mike.

I have made this letter longer than usual because I lack the time to make it shorter. Blaise Pascal

Mike Hewson
Mike Hewson
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Note that if you scroll down

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

I have made this letter longer than usual because I lack the time to make it shorter. Blaise Pascal

Rechenkuenstler
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If you search in the Apple

If you search in the Apple Appstore with the search key "gravitational wave events" you'll find the app. It shows all events and there related messages for finding optical counterparts all over the spectrum.

It also shows the initial LVC Preliminary and Skymap data.But it does not show the evolved masses. This informations are not public access

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