TITLE:   GCN CIRCULAR
NUMBER:  34787
SUBJECT: LIGO/Virgo/KAGRA S230930al: Updated Sky localization
DATE:    23/10/01 22:33:01 GMT
FROM:    Colm Talbot at University of Chicago <talbotcolm@gmail.com>

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 S230930al (GCN Circular 34783). 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/S230930al

For the Bilby.multiorder.fits,0 sky map, the 90% credible region is 3166 deg2. Marginalized over the whole sky, the a posteriori luminosity distance estimate is 4902 +/- 1671 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)