GCN Circular 35502

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

We identified the compact binary merger candidate S240109a during real-time processing of data from LIGO Hanford Observatory (H1) at 2024-01-09 05:04:31.842 UTC (GPS time: 1388811889.842). The candidate was found by the GstLAL [1] analysis pipeline.

S240109a is an event of interest because its false alarm rate, as estimated by the online analysis, is 7.3e-09 Hz, or about one in 4 years. The event's properties can be found at this URL:

https://gracedb.ligo.org/superevents/S240109a

The classification of the GW signal, in order of descending probability, is BBH (>99%), Terrestrial (<1%), NSBH (<1%), or BNS (<1%).

Assuming the candidate is astrophysical in origin, the probability that the lighter compact object is consistent with a neutron star mass (HasNS) is <1%. [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 either of the binary components lies between 3 and 5 solar masses (HasMassGap) is <1%.

Two sky maps are available at this time and can be retrieved from the GraceDB event page:
 * bayestar.multiorder.fits,0, an initial localization generated by BAYESTAR [3], distributed via GCN notice about 31 seconds after the candidate event time.
 * bayestar.multiorder.fits,1, an initial localization generated by BAYESTAR [3], distributed via GCN notice about 5 minutes after the candidate event time.

The preferred sky map at this time is bayestar.multiorder.fits,1. For the bayestar.multiorder.fits,1 sky map, the 90% credible region is 24220 deg2. Marginalized over the whole sky, the a posteriori luminosity distance estimate is 1529 +/- 515 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] Tsukada et al. PRD 108, 043004 (2023) and Ewing et al. arXiv:2305.05625
Not found
 
 
 (2023)
 [2] Chatterjee et al. ApJ 896, 54 (2020)
 [3] Singer & Price PRD 93, 024013 (2016)