[vsnet-grb-info 22423] LIGO/Virgo S190513bm: Identification of a GW compact binary merger candidate
GCN Circulars
gcncirc at capella2.gsfc.nasa.gov
Tue May 14 06:38:36 JST 2019
TITLE: GCN CIRCULAR
NUMBER: 24522
SUBJECT: LIGO/Virgo S190513bm: Identification of a GW compact binary merger candidate
DATE: 19/05/13 21:37:24 GMT
FROM: Marco Drago at GSSI <marco.drago at gssi.it>
The LIGO Scientific Collaboration and the Virgo Collaboration report:
We identified the compact binary merger candidate S190513bm during
real-time processing of data from LIGO Hanford Observatory (H1), LIGO
Livingston Observatory (L1), and Virgo Observatory (V1) at 2019-05-13
20:54:28.747 UTC (GPS time: 1241816086.747). The candidate was found
by the GstLAL [1], CWB [2], MBTAOnline [3], and spiir [4] analysis
pipelines.
S190513bm is an event of interest because its false alarm rate, as
estimated by the online analysis, is 3.7e-13 Hz, or about one in 1e5
years. The event's properties can be found at this URL:
https://gracedb.ligo.org/superevents/S190513bm
The classification of the GW signal, in order of descending
probability, is BBH (94%), MassGap (5%), NSBH (<1%), Terrestrial
(<1%), or BNS (<1%).
Assuming the candidate is astrophysical in origin, there is strong
evidence against the lighter compact object having a mass < 3 solar
masses (HasNS: <1%). Using the masses and spins inferred from the
signal, there is strong evidence against matter outside the final
compact object (HasRemnant: <1%).
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
[5], distributed via GCN notice about 27 minutes after the candidate
For the bayestar.fits.gz skymap, the 90% credible region is 691 deg2.
Marginalized over the whole sky, the a posteriori luminosity distance
estimate is 1987 +/- 501 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] Klimenko et al. PRD 93, 042004 (2016)
[3] Adams et al. CQG 33, 175012 (2016)
[4] Qi Chu, PhD Thesis, The University of Western Australia (2017)
[5] Singer & Price PRD 93, 024013 (2016)
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