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GCN Circular 36540

Subject
LIGO/Virgo/KAGRA S240525p: Updated Sky localization
Date
2024-05-25T13:54:06Z (2 months ago)
From
Geraint Pratten at University of Birmingham/LIGO <geraint.pratten@ligo.org>
Via
Web form
The LIGO Scientific Collaboration, the Virgo Collaboration, and the KAGRA Collaboration report:

We have conducted further analysis of the LIGO Hanford Observatory (H1), LIGO Livingston Observatory (L1), and Virgo Observatory (V1) data around the time of the compact binary merger (CBC) candidate S240525p (GCN Circular 36539). 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/S240525p

For the Bilby.multiorder.fits,0 sky map, the 90% credible region is 1517 deg2. Marginalized over the whole sky, the a posteriori luminosity distance estimate is 4337 +/- 1519 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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