TITLE: GCN CIRCULAR NUMBER: 37516 SUBJECT: LIGO/Virgo/KAGRA S240915bd: Updated Sky localization DATE: 24/09/15 14:22:10 GMT FROM: Nelson Christensen at Obs.de la Cote dAzur,Nice nelson.christensen@oca.eu

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 S240915bd (GCN Circular 37514). 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/S240915bd

For the Bilby.multiorder.fits,0 sky map, the 90% credible region is 4244 deg2. Marginalized over the whole sky, the a posteriori luminosity distance estimate is 612 +/- 139 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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