TITLE: GCN CIRCULAR NUMBER: 38720 SUBJECT: LIGO/Virgo/KAGRA S241225v: Updated Sky localization DATE: 24/12/30 05:09:07 GMT FROM: jgolomb@caltech.edu
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 S241225v (GCN Circular 38670). 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/S241225v
For the Bilby.multiorder.fits,0 sky map, the 90% credible region is 1192 deg2. Marginalized over the whole sky, the a posteriori luminosity distance estimate is 2008 +/- 695 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
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