TITLE: GCN CIRCULAR NUMBER: 34606 SUBJECT: LIGO/Virgo/KAGRA S230831e: Updated Sky localization DATE: 23/08/31 12:41:35 GMT FROM: Soichiro Morisaki at U. of Tokyo soichiro.morisaki@ligo.org
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 S230831e (GCN Circular 34605). Parameter estimation has been performed using Bilby [1] and a new sky map, Bilby.offline0.multiorder.fits,0, distributed via GCN Notice, is available for retrieval from the GraceDB event page:
https://gracedb.ligo.org/superevents/S230831e
For the Bilby.offline0.multiorder.fits,0 sky map, the 90% credible region is 3803 deg2. Marginalized over the whole sky, the a posteriori luminosity distance estimate is 4900 +/- 2126 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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