TITLE:   GCN CIRCULAR
NUMBER:  34270
SUBJECT: LIGO/Virgo/KAGRA S230726a: Updated Sky localization
DATE:    23/07/26 17:22:24 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 Livingston Observatory
(L1) data around the time of the compact binary merger (CBC) candidate
S230726a (GCN Circular 34264).
Parameter estimation has been performed using Bilby [1] and a new sky
map, Bilby.multiorder.fits,0, distributed via GCN Notice, is available
for retrieval from the GraceDB event page:

https://gracedb.ligo.org/superevents/S230726a

For the Bilby.multiorder.fits,0 sky map, the 90% credible region is
27774 deg2. Marginalized over the whole sky, the a posteriori
luminosity distance estimate is 2132 +/- 714 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)