Data release for event GW170104

This page has been prepared by the LIGO Scientific Collaboration (LSC) and the Virgo Collaboration to inform the broader community about a confirmed astrophysical event observed by the gravitational-wave detectors, and to make the data around that time available for others to analyze.

GW170104 was observed at GPS time 1167559936.6 == January 04 2017, 10:11:58.6 UTC. It was recovered with a network signal-to-noise ratio of 13 and a false-alarm-rate of once per 70,000 years. The event was detected in data from the LIGO Hanford and LIGO Livingston observatories.

  • This page serves as a supplement to the paper GW170104: Observation of a 50-solar-mass binary black hole coalescence at redshift 0.2 which is available from LIGO DCC.
  • There are more open data about this event, in the files attached to the above paper in the LIGO DCC.
  • There are Science Summaries, covering the information below in ordinary language.
  • This dataset has the Digital Object Identifier (doi) https://doi.org/10.7935/K53X84K2
  • There are tutorials to work with the strain data.
  • There is a one page factsheet about GW170104, summarizing the event.
  • There is a technical details page about the data linked below, and feel free to contact us.

    • Estimated Source Parameters

    QuantityValueUnit
    UTC time2017-01-04T10:11:58.6
    GPS time1167559936.6
    Primary mass31.2 +8.4 -6.0Msun
    Secondary mass19.4 +5.3 -5.9Msun
    Chirp mass21.1 +2.4 -2.7Msun
    Total mass50.7 +5.9 -5.0Msun
    Final mass48.7 +5.7 -4.6Msun
    Radiated energy2.0 +0.6 -0.7Msun c^2
    Peak luminosity3.1 +0.7 -1.310^56 erg s^-1
    Effective inspiral spin-0.12 +0.21 -0.30
    Final spin0.64 +0.09 -0.20
    Luminosity distance880 +450 -390Mpc
    Source redshift0.18 +0.08 -0.07
    False alarm rate< 1.4e-05yr^-1
    Signal to Noise Ratio13
    Sky localization1200deg^2

    The data from the observatories from which the science is derived:

    Gravitational-Wave Strain Data

    Strain Data at 4096 Hz

    Strain h(t) time series centered at GPS 1167559936,
    HanfordLivingston
    32 seconds
    (event is 16.60 seconds from start)    		hdf5
    gwf
    txt.gz    		 hdf5
    gwf
    txt.gz
    4096 seconds
    (event is 2048.60 seconds from start)    		hdf5
    gwf
    txt.gz    		 hdf5
    gwf
    txt.gz

    Strain Data at 16384 Hz

    Strain h(t) time series centered at GPS 1167559936,
    HanfordLivingston
    32 seconds
    (event is 16.60 seconds from start)    		hdf5
    gwf
    txt.gz    		 hdf5
    gwf
    txt.gz
    4096 seconds
    (event is 2048.60 seconds from start)    		hdf5
    gwf
    txt.gz    		 hdf5
    gwf
    txt.gz

    Sky Localization

    The location of GW170104 in the sky can be determined only roughly using the data from the two gravitational-wave detectors. A "skymap", representing the position probability as a function of astronomical sky coordinates (right ascension and declination), was initially computed by a software package called BAYESTAR. After final calibration of the data, the skymap was recomputed with a more sophisticated package called LALInference which simultaneously adjusts all the source parameters and allows for calibration uncertainties.

    Low-latency (rapid) skymap from BAYESTAR:
    FITS DATA

    Skymap Viewer

    Refined skymap from LALInference:
    FITS DATA

    Skymap Viewer

    A python library for reading the FITS DATA is 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.

    About the Instruments and Collaborations

    See the instruments and collaborations page.

    There is a technical details page about the data linked above, and feel free to contact us.

    Revision History