Data release for candidate event LVT151012
This page has been prepared by the LIGO Scientific Collaboration (LSC) and the Virgo Collaboration to inform the broader community about a candidate astrophysical event observed by the gravitational-wave detectors, and to make the data around that time available for others to analyze.
The candidate event occurred at GPS time 1128678900.44 == October 12, 2015 at 09:54:43.44 UTC. It was recovered with a network signal-to-noise ratio of 9.7 and a significance of 1.7 sigma. The candidate event was detected in data from the LIGO Hanford and LIGO Livingston observatories.
Estimated Source Parameters
The data from the observatories from which the science is derived:
Gravitational-Wave Strain Data
Strain Data at 4096 HzStrain h(t) time series centered at GPS 1128678900,
Strain Data at 16384 HzStrain h(t) time series centered at GPS 1128678900,
Sky localizationThe pipeline that produced this sky localization information was LALInference. There is an initial version that was sent to follow-up observers, and a final, improved version.
The skymap can be visualized in an astronomical context:
The skymaps are represented as HEALPIX-FITS files in equatorial frame, available gzipped:healpy. A very simple healpy code to work with LIGO-Virgo skymaps is here. A large number of simulated skymaps is available here and here.
Audio FilesThese files are derived from the strain data above, through signal processing as defined in the tutorial notebook "Tutorial on Binary Black Hole Signals in LIGO Open Data", that can be found in the tutorials section of this website.
About the Instruments and Collaborations
The LIGO Observatory
The Laser Interferometer Gravitational-Wave Observatory (LIGO) consists of two widely separated installations within the United States one in Hanford, Washington and the other in Livingston, Louisiana operated in unison as a single observatory. LIGO is operated by the LIGO Laboratory, a consortium of the California Institute of Technology (Caltech) and the Massachusetts Institute of Technology (MIT). Funded by the National Science Foundation, LIGO is an international resource for both physics and astrophysics.
The GEO600 Detector
The GEO600 project aims at the direct detection of gravitational waves by means of a laser interferometer of 600 m armlength located near Hannover, Germany. Besides collecting data for gravitational wave searches, the GEO600 detector has been used to develop and test advanced instrumentation for gravitational wave detection.
The LIGO Scientific Collaboration
The LIGO Scientific Collaboration (LSC) is a group of scientists seeking to make the first direct detection of gravitational waves, use them to explore the fundamental physics of gravity, and develop the emerging field of gravitational wave science as a tool of astronomical discovery. The LSC works toward this goal through research on, and development of techniques for, gravitational wave detection, and the development, commissioning and exploitation of gravitational wave detectors. The LSC carries out the science of the LIGO and GEO600 Observatories. Participation in the LSC is open to all interested scientists and engineers from educational and research institutions.