[vsnet-grb-info 24471] LIGO/Virgo S191216ap: Updated Source Classification

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  26570
SUBJECT: LIGO/Virgo S191216ap: Updated Source Classification
DATE:    19/12/23 18:27:02 GMT
FROM:    Brandon Piotrzkowski at U of Wisconsin-Milwaukee  <piotrzk3 at uwm.edu>

The LIGO Scientific Collaboration and the Virgo Collaboration report:

We have conducted further analysis of the LIGO Hanford Observatory
(H1) and Virgo Observatory (V1) data around the time of the compact
binary merger (CBC) candidate S191216ap (GCN Circular 26454).

Assuming the candidate is astrophysical, the updated parameter
estimation based classification of the GW signal, in order of
descending probability, is BBH (>99%), MassGap (<1%),
Terrestrial (<1%), BNS (<1%), or NSBH (<1%).

For further information about analysis methodology and the contents of
this alert, refer to the LIGO/Virgo Public Alerts User Guide
<https://emfollow.docs.ligo.org/userguide/>.

 [1] Veitch et al. PRD 91, 042003 (2015)