TITLE: GCN CIRCULAR NUMBER: 38760 SUBJECT: LIGO/Virgo/KAGRA S250101k: Updated Sky localization and Source Classification DATE: 25/01/01 17:21:16 GMT FROM: Sylvia Biscoveanu at Northwestern CIERA sylvia.biscoveanu@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 S250101k (GCN Circular 38747). 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/S250101k
The updated classification of the GW signal, in order of descending probability, is BBH (96%), Terrestrial (4%), NSBH (<1%), or BNS (<1%).
For the Bilby.multiorder.fits,0 sky map, the 90% credible region is 455 deg2. Marginalized over the whole sky, the a posteriori luminosity distance estimate is 3231 +/- 945 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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