TITLE:   GCN CIRCULAR
NUMBER:  38741
SUBJECT: LIGO/Virgo/KAGRA S241230bd: Updated Sky localization
DATE:    24/12/31 16:50:25 GMT
FROM:    Sylvia Biscoveanu at Northwestern CIERA <sylvia.biscoveanu@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) and Virgo Observatory (V1) data around the time of the compact binary merger (CBC) candidate S241230bd (GCN Circular 38722). 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/S241230bd

For the Bilby.multiorder.fits,0 sky map, the 90% credible region is 11129 deg2. Marginalized over the whole sky, the a posteriori luminosity distance estimate is 2811 +/- 842 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/.

 [1] Ashton et al. ApJS 241, 27 (2019) doi:10.3847/1538-4365/ab06fc and Morisaki et al. (2023) arXiv:2307.13380