LIGO/Virgo S200213t: Identification of a GW compact binary merger candidate
Abstract
We identified the compact binary merger candidate S200213t during realtime processing of data from LIGO Hanford Observatory (H1), LIGO Livingston Observatory (L1), and Virgo Observatory (V1) at 20200213 04:10:40.328 UTC (GPS time: 1265602258.328). The candidate was found by the GstLAL [1] analysis pipeline. S200213t is an event of interest because its false alarm rate, as estimated by the online analysis, is 1.8e08 Hz, or about one in 1 year, 9 months. The event's properties can be found at this URL: https://gracedb.ligo.org/superevents/S200213t The classification of the GW signal, in order of descending probability, is BNS (63%), Terrestrial (37%), BBH (<1%), MassGap (<1%), or NSBH (<1%). Assuming the candidate is astrophysical in origin, the probability that the lighter compact object has a mass < 3 solar masses (HasNS) is >99%. Using the masses and spins inferred from the signal, the probability of matter outside the final compact object (HasRemnant) is >99%. Two sky maps are available at this time and can be retrieved from the GraceDB event page: * bayestar.fits.gz,0, an initial localization generated by BAYESTAR [2], distributed via GCN notice about 2 minutes after the candidate event time. * bayestar.fits.gz,1, an initial localization generated by BAYESTAR [2], distributed via GCN notice about 7 minutes after the candidate event time. The preferred sky map at this time is bayestar.fits.gz,1. For the bayestar.fits.gz,1 sky map, the 90% credible region is 2587 deg2. Marginalized over the whole sky, the a posteriori luminosity distance estimate is 224 +/ 90 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)
 Publication:

GRB Coordinates Network
 Pub Date:
 February 2020
 Bibcode:
 2020GCN.27042....1L