TITLE:   GCN CIRCULAR
NUMBER:  34770
SUBJECT: LIGO/Virgo/KAGRA S230922q: Updated Sky localization
DATE:    23/09/26 19:40:42 GMT
FROM:    naresh.adhikari@ligo.org

The LIGO Scientific Collaboration, the Virgo Collaboration, and the
KAGRA Collaboration report:

We have conducted further analysis of the LIGO Hanford Observatory
(H1) and LIGO Livingston Observatory (L1) data around the time of the
compact binary merger (CBC) candidate S230922q (GCN Circular 34756). Parameter estimation has been
performed using Bilby [1] and a new sky map,
Bilby.offline0.multiorder.fits,0, distributed via GCN Notice, is
available for retrieval from the GraceDB event page:

https://gracedb.ligo.org/superevents/S230922q

For the Bilby.offline0.multiorder.fits,0 sky map, the 90% credible
region is 4658 deg2. Marginalized over the whole sky, the a posteriori
luminosity distance estimate is 6653 +/- 2348 Mpc (a posteriori mean
+/- standard deviation).

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


 [1] Ashton et al. ApJS 241, 27 (2019)