TITLE: GCN CIRCULAR NUMBER: 39522 SUBJECT: LIGO/Virgo/KAGRA S250226dl: Updated Sky localization DATE: 25/02/27 17:34:46 GMT FROM: ethan.payne@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 S250226dl (GCN Circular 39504). 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/S250226dl
For the Bilby.multiorder.fits,0 sky map, the 90% credible region is 1218 deg2. Marginalized over the whole sky, the a posteriori luminosity distance estimate is 3361 +/- 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/.
[1] Ashton et al. ApJS 241, 27 (2019) doi:10.3847/1538-4365/ab06fc and Morisaki et al. (2023) arXiv:2307.13380
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