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GCN Circular 34745

Subject

LIGO/Virgo/KAGRA S230919bj: Updated Sky localization

Date

2023-09-20T16:32:15Z (a year ago)

From

naresh.adhikari@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 S230919bj (GCN Circular 34739Loading...
 
 ). 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/S230919bj

For the Bilby.multiorder.fits,0 sky map, the 90% credible region is
708 deg2. Marginalized over the whole sky, the a posteriori luminosity
distance estimate is 1491 +/- 402 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)