Gravitational Wave Open Science Center

Data release for event GW170814

This page has been prepared by the LIGO Scientific Collaboration (LSC) and the Virgo Collaboration.

The event occurred at GPS time 1186741861.53 = August 14 2017, 10:30:43.53 UTC.

The event was detected in data from the LIGO Hanford (H1), LIGO Livingston (L1) and Virgo (V1) detectors.

This page serves as a supplement to the paper GW170814 : A three-detector observation of gravitational waves from a binary black hole coalescence, available from doi:10.1103/PhysRevLett.119.141101.


Gravitational-Wave Strain Data


Strain data after noise subtraction

Several noise sources that are linearly coupled to the GW data channel can be subtracted in post-processing, using auxiliary sensors (e.g. photodiodes monitoring beam motion). For LIGO, we remove calibration lines, power mains and harmonics, the effect of some length and angular controls, and the effect of laser beam motion. This noise removal can improve the sensitivity of the LIGO detectors by approximately 20%. For Virgo, we remove the effect of some length controls, and the laser frequency stabilization control. For reference:

Notes:

After noise subtraction, 4096 Hz H1 L1 V1
32 seconds (event signal reaches peak amplitude 16.53 seconds ± 30 msec from start†) hdf5 gwf txt.gz hdf5 gwf txt.gz hdf5 gwf txt.gz
3584 or 4096 seconds‡ hdf5 gwf txt.gz hdf5 gwf txt.gz hdf5 gwf txt.gz
After noise subtraction, 16384 Hz H1 L1 V1
32 seconds (event signal reaches peak amplitude 16.53 seconds ± 30 msec from start†) hdf5 gwf txt.gz hdf5 gwf txt.gz hdf5 gwf txt.gz
3584 or 4096 seconds‡ hdf5 gwf txt.gz hdf5 gwf txt.gz hdf5 gwf txt.gz

† The ± 30 msec window for peak amplitude is due to different arrival times in each of the three detectors.

‡ The H1, L1 datasets for strain data after noise subtraction are 3584 seconds long with the event signal reaching peak amplitude 1792.53 seconds ± 30 msec from start†. The V1 data files are 4096 seconds long, with the signal reaching peak amplitude 2048.53 ± 30 ms from the start of the file.


Strain data before noise subtraction

These files contain data before noise subtraction. These data were produced in low-latency, and used by the search pipelines to evaluate event significance.

Notes:

Before noise subtraction, 4096 Hz H1 L1 V1
32 seconds (event signal reaches peak amplitude 16.53 seconds ± 30 msec from start†) hdf5 gwf txt.gz hdf5 gwf txt.gz hdf5 gwf txt.gz
4096 seconds (event signal reaches peak amplitude 2048.53 seconds ± 30 msec from start†) hdf5 gwf txt.gz hdf5 gwf txt.gz hdf5 gwf txt.gz
Before noise subtraction, 16384 Hz H1 L1 V1
32 seconds (event signal reaches peak amplitude 16.53 seconds ± 30 msec from start†) hdf5 gwf txt.gz hdf5 gwf txt.gz hdf5 gwf txt.gz
4096 seconds(event signal reaches peak amplitude 2048.53 seconds ± 30 msec from start†) hdf5 gwf txt.gz hdf5 gwf txt.gz hdf5 gwf txt.gz

† The ± 30 msec window for peak amplitude is due to different arrival times in each of the three detectors.


Sky Localization

Source localization data for GW170814 are available as LIGO T1700453

Rapid triggers from LIGO data are available as GCN notices for GW170814


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The technical details provides detailed usage notes.

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