TITLE:   GCN CIRCULAR
NUMBER:  34931
SUBJECT: LIGO/Virgo/KAGRA S231102w: Updated Sky localization
DATE:    23/11/03 01:01:38 GMT
FROM:    Charlie Hoy at University of Portsmouth <charlie.hoy@port.ac.uk>

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 S231102w (GCN Circular 34927). Parameter estimation has been performed using Bilby [1] and a new sky map, Bilby.multiorder.fits, distributed via GCN Notice, is available for retrieval from the GraceDB event page:

https://gracedb.ligo.org/superevents/S231102w

For the Bilby.multiorder.fits sky map, the 90% credible region is 2343 deg2. Marginalized over the whole sky, the a posteriori luminosity distance estimate is 3493 +/- 1015 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) and Morisaki et al. arXiv:2307.13380 (2023)