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GCN Circular 34213

Subject
LIGO/Virgo/KAGRA S230709bi: Updated Sky localization
Date
2023-07-13T17:38:51Z (9 months ago)
From
Colm Talbot at MIT <talbotcolm@gmail.com>
The LIGO Scientific Collaboration, the Virgo Collaboration, and the
KAGRA Collaboration report:

We have conducted further offline analysis of the LIGO Hanford Observatory
(H1) and LIGO Livingston Observatory (L1) data around the time of the
compact binary merger (CBC) candidate S230709bi (GCN Circular 34175). 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/S230709bi

For the Bilby.multiorder.fits,0 sky map, the 90% credible region is
2644 deg2. Marginalized over the whole sky, the a posteriori
luminosity distance estimate is 4364 +/- 1585 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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