TITLE:   GCN CIRCULAR
NUMBER:  41031
SUBJECT: LIGO/Virgo/KAGRA S250701bq: Updated Sky localization
DATE:    25/07/08 15:39:52 GMT
FROM:    lucy.thomas@ligo.org

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 S250701bq (GCN Circular 40880). Parameter estimation has been performed using Bilby [1] and a new sky map, Bilby.multiorder.fits,0, distributed via GCN and SCiMMA notices, is available for retrieval from the GraceDB event page:

https://gracedb.ligo.org/superevents/S250701bq

For the Bilby.multiorder.fits,0 sky map, the 90% credible region is 25010 deg2. Marginalized over the whole sky, the a posteriori luminosity distance estimate is 480 +/- 118 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 and Morisaki et al. PRD 108, 123040 (2023) doi:10.1103/PhysRevD.108.123040