O3a Alternate Calibration Release
This data set includes several versions of the strain channel
recorded during the LIGO/Vigo O3a observing run. For context, see the
O3a data release documentation
Single Computer Access
For work on a single computer, data may be accessed from a network data server (NDS2) using
the NDS2 client
from gwpy.timeseries import TimeSeries
data = TimeSeries.fetch('H1:DCS-CALIB_STRAIN_CLEAN_C01_AR', start=1240559616, end=1240559626, host='losc-nds.ligo.org')
For more examples of working with the NDS2 server, See the
NDS2 Example Code
Computer Cluster Access
For users of computer clusters, data are available via CVMFS.
- To set up CVMFS on your computer, see CVMFS instructions.
- If you are working on a computer cluster which already has access to LIGO/Virgo data, see
accessing IGWN data.
- Data gaps represent times when data are not available (e.g. the instrument was not running)
Download CSV Segment Lists:
- For LIGO, all data marked as
ANALYSIS READY are included in the release.
- For Virgo, all data that passes
CAT 1 data quality are included in the release.
- A small amount of time around GW190814 is missing from the channel
these times were initially marked outside of observing mode
- Missing segments:
[1249847058, 1249851715) [1249852276, 1249852862)
- The Timelines
DATA segment list only includes times that pass CAT 1 data quality.
For some times,
LIGO data may be available in this multi-channel release, but not included in the Timeline segment lists.
|C01 calibrated strain data (final calibration)
| C01 calibrated strain data, after applying
linear noise subraction
|C01 data, after applying both
non-linear noise subtraction.
For LIGO O3a data, this is the recommended channel.
|Virgo data for most of O3a
|Only available for the last two weeks of September 2019.
The reprocessing was motivated by an improvement of the noise subtraction
with respect to the changing ITF working point during tests of Etalon effect control.