GCN Circular 24442
Subject
LIGO/Virgo S190510g: Identification of a GW compact binary merger candidate
Date
2019-05-10T05:51:38Z (6 years ago)
From
Eric Howell at Aus.Intl.Grav.Res.Centre/UWA <eric.howell@uwa.edu.au>
The LIGO Scientific Collaboration and the Virgo Collaboration report:
We identified the compact binary merger candidate S190510g during
real-time processing of data from LIGO Hanford Observatory (H1), LIGO
Livingston Observatory (L1), and Virgo Observatory (V1) at 2019-05-10
02:59:39.292 UTC (GPS time: 1241492397.292). The candidate was found
by the GstLAL [1] analysis pipeline.
S190510g is an event of interest because its false alarm rate, as
determined by the online analysis, is 8.4e-10 Hz, or about one in 37
years. The event's properties can be found at this URL:
https://gracedb.ligo.org/superevents/S190510g
The classification of the GW signal, in order of descending
probability, is BNS (98%), Terrestrial (2%), NSBH (<1%), BBH (<1%), or
MassGap (<1%).
Assuming the candidate is astrophysical in origin, there is strong
evidence for the lighter compact object having a mass < 3 solar masses
(HasNS: >99%). Using the masses and spins inferred from the signal,
there is strong evidence for matter outside the final compact object
(HasRemnant: >99%).
One skymap is available at this time and can be retrieved from the
GraceDB event page:
* bayestar.fits.gz, an updated localization generated by BAYESTAR
[2], distributed via GCN notice about an hour after the candidate
For the bayestar.fits.gz skymap, the 90% credible region is 3462 deg2.
Marginalized over the whole sky, the a posteriori luminosity distance
estimate is 269 +/- 108 Mpc (a posteriori mean +/- standard
deviation).
For further information about analysis methodology and the contents of
this alert, refer to the LIGO/Virgo Public Alerts User Guide
<https://emfollow.docs.ligo.org/userguide/>.
[1] Messick et al. PRD 95, 042001 (2017)
[2] Singer & Price PRD 93, 024013 (2016)