GCN Circular 33891

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
S230529ay (GCN Circular 33889
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 ).
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/S230529ay

Based on posterior support from parameter estimation [1], under the
assumption that the candidate S230529ay is astrophysical in origin,the
probability that the lighter compact object is consistent with a
neutron star mass (HasNS) is 98%. [2] Using the masses and spins
inferred from the signal, the probability of matter outside the final
compact object (HasRemnant) is 1%. [2] Both HasNS and HasRemnant
consider the support of several neutron star equations of state. The
probability that any one of the binary components lie between 3 to 5
solar mass (HasMassgap) is 69%.

For the Bilby.multiorder.fits,0 sky map, the 90% credible region is
25623 deg2. Marginalized over the whole sky, the a posteriori
luminosity distance estimate is 201 +/- 63 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)
 [2] Chatterjee et al. The Astrophysical Journal 896, 1 (2020)