TITLE:   GCN CIRCULAR
NUMBER:  34522
SUBJECT: LIGO/Virgo/KAGRA S230822bm: Updated Sky localization
DATE:    23/08/23 02:28:53 GMT
FROM:    Aaron Zimmerman at U. of Texas at Austin <aaron.zimmerman@utexas.edu>

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 S230822bm (GCN Circular 34520). 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/S230822bm

For the Bilby.multiorder.fits,0 sky map, the 90% credible region is 3974 deg2. Marginalized over the whole sky, the a posteriori luminosity distance estimate is 5154 +/- 1771 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)