TITLE: GCN CIRCULAR NUMBER: 39874 SUBJECT: LIGO/Virgo/KAGRA S250326y: Updated Sky localization DATE: 25/03/26 15:19:25 GMT FROM: A. Domiciano at Côte d’Azur Observatory armando.domiciano@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), LIGO Livingston Observatory (L1), and Virgo Observatory (V1) data around the time of the compact binary merger (CBC) candidate S250326y (GCN Circular 39871). 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/S250326y
For the Bilby.multiorder.fits,0 sky map, the 90% credible region is 1460 deg2. Marginalized over the whole sky, the a posteriori luminosity distance estimate is 5412 +/- 1720 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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