GCN Circular 38303

The LIGO Scientific Collaboration, the Virgo Collaboration, and the KAGRA Collaboration report:

We have conducted further analysis of the LIGO Livingston Observatory (L1) data around the time of the compact binary merger (CBC) candidate S241122a (GCN Circular 38301
Not found
 
 
). 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/S241122a

After parameter estimation by RapidPE-RIFT [2], the updated classification of the GW signal, in order of descending probability, is BBH (96%), Terrestrial (4%), NSBH (<1%), or BNS (<1%).

For the Bilby.multiorder.fits,0 sky map, the 90% credible region is 28550 deg2. Marginalized over the whole sky, the a posteriori luminosity distance estimate is 2267 +/- 948 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/.

 [1] Ashton et al. ApJS 241, 27 (2019) doi:10.3847/1538-4365/ab06fc
Not found
 
 
 and Morisaki et al. PRD 108, 123040 (2023) doi:10.1103/PhysRevD.108.123040
Not found
 
 

 [2] Rose et al. (2022) arXiv:2201.05263
Not found
 
 
 and Pankow et al. PRD 92, 023002 (2015) doi:10.1103/PhysRevD.92.023002
Not found