TITLE: GCN CIRCULAR NUMBER: 38361 SUBJECT: LIGO/Virgo/KAGRA S241127aj: Updated Sky localization DATE: 24/11/28 05:18:19 GMT FROM: ethan.payne@ligo.org

The LIGO Scientific Collaboration, the Virgo Collaboration, and the KAGRA Collaboration report:

We have conducted further offline analysis of the LIGO Hanford Observatory (H1), LIGO Livingston Observatory (L1), and Virgo Observatory (V1) data around the time of the compact binary merger (CBC) candidate S241127aj (GCN Circular 38336). Parameter estimation has been performed using Bilby [1] and a new sky map, Bilby.offline0.multiorder.fits,0, distributed via GCN Notice, is available for retrieval from the GraceDB event page:

https://gracedb.ligo.org/superevents/S241127aj

For the Bilby.offline0.multiorder.fits,0 sky map, the 90% credible region is 105 deg2. Marginalized over the whole sky, the a posteriori luminosity distance estimate is 1100 +/- 99 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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