TITLE: GCN CIRCULAR NUMBER: 41626 SUBJECT: LIGO/Virgo/KAGRA S250830m: Updated Sky localization DATE: 25/09/01 08:29:41 GMT FROM: alexandresebastien.goettel@LIGO.org

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 S250830m (GCN Circular 41601). Parameter estimation has been performed using Bilby [1] and a new sky map, Bilby.multiorder.fits,0, distributed via GCN and SCiMMA notices, is available for retrieval from the GraceDB event page:

https://gracedb.ligo.org/superevents/S250830m

For the Bilby.multiorder.fits,0 sky map, the 90% credible region is 3194 deg2. Marginalized over the whole sky, the a posteriori luminosity distance estimate is 3731 +/- 1474 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. PRD 108, 123040 (2023) doi:10.1103/PhysRevD.108.123040

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