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.




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:
  • Below are links to strain h(t) time series centered at GPS 1186741861.
  • The noise subtraction procedure applies a window which tapers the first and last few minutes of the H1 and L1 data files. To remove this corrupt data, the H1 and L1 cleaned data files have been shortened to a total duration of 3584 seconds.
  • The H1 and L1 noise subtraction procedure introduces excess noise at frequencies below 20 Hz. Users should restrict analysis to frequencies above 20 Hz.
  • The files and some technical notes may all be found in LIGO P1700341
  • md5 checksums may be used to ensure files are correctly downloaded.
After noise subtraction, 4096 HzH1L1V1
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 HzH1L1V1
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:
  • Below are links to strain h(t) time series centered at GPS 1186741861.
  • Data are typically noisy and unreliable at frequencies below 20 Hz.
  • The files and some technical notes may all be found in LIGO P1700340
  • md5 checksums may be used to ensure files are correctly downloaded.
Before noise subtraction, 4096 HzH1L1V1
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 HzH1L1V1
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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