GCN Circular 38894
Subject
LIGO/Virgo/KAGRA S250109bi: Updated Sky localization
Date
2025-01-10T14:58:34Z (3 days ago)
From
alexandresebastien.goettel@LIGO.org
Via
Web form
The LIGO Scientific Collaboration, the Virgo Collaboration, and the KAGRA 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 S250109bi (GCN Circular 38863). 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/S250109bi
For the Bilby.multiorder.fits,0 sky map, the 90% credible region is 2819 deg2. Marginalized over the whole sky, the a posteriori luminosity distance estimate is 2255 +/- 734 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