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GCN Circular 34548

Subject
LIGO/Virgo/KAGRA S230825k: Updated Sky localization
Date
2023-08-25T12:45:11Z (8 months ago)
From
Michael J. Williams at University of Glasgow <michael.williams@ligo.org>
Via
Web form
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 S230825k (GCN Circular 34546). 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/S230825k

For the Bilby.offline0.multiorder.fits,0 sky map, the 90% credible region is 3012 deg2. Marginalized over the whole sky, the a posteriori luminosity distance estimate is 5283 +/- 2117 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/userguide/.


 [1] Ashton et al. ApJS 241, 27 (2019)
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