Here we describe how to perform the analysis of GWTC-1 and GWTC-2 events with the coherent WaveBurst pipeline.
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First step is to setup a cWB environment:
- The easiest way to start using cWB on your computer is to install an “image” of cWB within a “virtualized”/“containerized” environment: you can freely choose between the cWB VirtualBox image and the cWB Docker container. Instructions on how to run cWB on VirtualBox and Docker are reported in the cWB User Manual, here and here, repectively.
- Alternatively, for linux systems only, you can follow the steps described in the cWB User Manual, here and complete a full-installation.
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Once you have a working cWB (via VitualBox, Docker, or full installation), you can start with some basic event reconstruction on the public GW events from the first and second GWTCs (Gravitational-Wave Transient Catalogs of Compact Binary Mergers) currently available, i.e. those Observed by LIGO and Virgo during the First, Second and Third Observing Runs) and reported in the GWOSC.
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The analysis of GWTC Catalogs events can be easily performed with a dedicated cWB command: cwb_gwosc.
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For example, considering the first GW detection, GW150914, the command line to execute the full analysis (i.e. also gathering all relevant data released by the Gravitational Wave Open Science Center (GWOSC)) is:
cwb_gwosc GW=GW150914 all
- Somewhat similarly, the following command launches a full GW150914 analysis on simulated data. This instruction downloads from GWOSC the Power Spectral Densities (PSDs) and the Parameter Estimation (PE) posterior samples for GW150914. The PSDs are used to simulate a stationary colored Gaussian noise on which a random PE sample waveform is added. In simulation mode, you can compare injected and reconstructed waveforms both in time and in frequency domain.
cwb_gwosc GW=GW150914 SIM=true all
- The output of the previous commands has the form of the Coherent Event Display (CED) of the GW150914 event (e.g. see the CEDs of the GWTC-1 Catalog reported here). Once the previous commands have completed (it takes a few minutes to download locally all the GW data and process it on a laptop), you can navigate in the CED with your default browser (adding SIM=true in case of simulation):
cwb_gwosc GW=GW150914 xced