GCN Circular 24375
Subject
LIGO/Virgo S190421ar: Updated localization and classification from LIGO and Virgo data
Date
2019-05-03T16:14:06Z (6 years ago)
From
Erik Katsavounidis at MIT <kats@ligo.mit.edu>
The LIGO Scientific Collaboration and the Virgo Collaboration report:
We have re-analyzed LIGO and Virgo data around the time of the
compact binary coalescence (CBC) candidate S190421ar
(GCN 24141). Parameter estimation has been performed using
LALInference [1] and a new sky map, LALInference.fits.gz,
distributed via GCN Notice about 11 days after the candidate,
is available for retrieval from the GraceDB event page:
https://gracedb.ligo.org/superevents/S190421ar
The updated classification of the GW signal, in order of descending
probability, is BBH (97%), Terrestrial (3%), BNS (<1%), NSBH (<1%),
or MassGap (<1%).
For the LALInference.fits.gz skymap, the 90% credible region is
1444 deg2. Marginalized over the whole sky, the a posteriori
luminosity distance estimate is 1628 +/- 535 Mpc (a posteriori
mean +/- standard deviation). This is the preferred sky map at
this time.
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] Veitch et al. PRD 91, 042003 (2015)