LIGO and Virgo Data
The LIGO Laboratory's Data Management Plan
describes the scope and timing of LIGO data releases.
Data for Events
O1 Data Release
O1 Time Range
: September 12, 2015 through January 19, 2016
: H1 and L1
S6 Data Release
S6 Time Range
: July 7, 2009 through October 20, 2010
: H1 and L1
S5 Data Release
S5 Time Range
: November 4, 2005 through October 1, 2007
: H1, H2, and L1
Science Mode Times for LIGO/Virgo/GEO Network
: 2004 through 2014
: H1, H2, L1, G1, V1
Only Timeline information is available for this data set.
Data Usage Notes Please Read This First!
LIGO and Virgo data cannot be effectively used without understanding these features. See the links below for more details.
- 3 LIGO detectors operated during LIGO science run 5 (S5, Nov 2005 to Oct 2007):
- H1 and H2 at Hanford, Washington (LHO), and L1 at Livingston, Louisiana (LLO).
- 2 LIGO detectors operated from 2009 onwards, during LIGO science run 6 (S6, Jul 2009 to Oct 2010) and
LIGO observing runs 1 (O1, Sep 2015 to Jan 2016) and 2 (O2, Nov 2016 to Aug 2017):
- H1 at Hanford, Washington, and L1 at Livingston, Louisiana.
- The Virgo detector operated from 2007 onwards, with an overlap with the LIGO science runs 5 and 6, and the LIGO observing run 2 (O2):
- Detector positions are
as recorded in LALSuite
- Injections in the data are simulated versions of astrophysical signals.
- If you 'discover' an interesting signal in LIGO data, it could be a known injection.
- Lists of injection times are available for the S5, S6, and O1 data sets.
- Instrumental glitches are in the data.
They are not astrophysical in origin, but can mimic such signals.
More information is available on the Data Release pages above.
- Depending on the data set, the LOSC strain data are available in the original 16384 Hz sample rate, or
downsampled from 16384 Hz to 4096 Hz.
- Data quality categories are used to characterize the quality of data at a given time.
- Data which fails CAT 1 flags should not be searched for astrophysical signals.
- All data analysis by the LIGO Scientific Collaboration vetos data
that fail CAT 1 or CAT 2 flags.
- See the run documentation above for details
- Instrumental lines in the data are seen at quasi-constant frequencies that are artifacts, and can mimic astrophysical signals.
- Gaps in the data occur when the detectors were not in their standard configuration (e.g maintenance).
- Short Segments: Standard signal processing methods applied to very short segments (<16 sec) must be used with caution and could produce spurious results.
- Frequency dependent noise in the data is only roughly Gaussian.
- The noise spectrum also varies with time.
- See the plot gallery.
- Advanced LIGO and Virgo strain data are not calibrated below 10 Hz.
Advanced LIGO detector noise rises rapidly below 10 Hz;
it is many orders of magnitude larger than any plausible
gravitational wave strain signal.
Further, the data made available on LOSC are aggressively
high-pass-filtered at 8 Hz in order to avoid downstream signal
processing problems, so it doesn't properly represent either
signal or noise at those low frequencies. In particular, any DC offsets have no significance. In the Initial
LIGO (S5 and S6) datasets, data below 40 Hz is similarly
uncalibrated and suppressed. The 8 Hz roll-off is visible in this
example low frequency spectrum.