TITLE: GCN CIRCULAR NUMBER: 34777 SUBJECT: LIGO/Virgo/KAGRA S230927l: Updated Sky localization DATE: 23/09/28 03:50:19 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 S230927l (GCN Circular 34773). 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/S230927l
For the Bilby.multiorder.fits,0 sky map, the 90% credible region is 1177 deg2. Marginalized over the whole sky, the a posteriori luminosity distance estimate is 2966 +/- 1041 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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