Note
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Accessing and visualising public GW detector data¶
Data from the current generation gravitational wave detectors are published by The Gravitational-Wave Open Science Centre (GWOSC) and freely available to the public. In this example we demonstrate how to identify times of a published GW detection event, and to download and visualise detector data.
Firstly, we can use the gwosc
Python package to query for the
time of the first gravitational-wave detection GW150914:
from gwosc.datasets import event_gps
gps = event_gps("GW150914")
GWpy’s TimeSeries
class provides an interface to the public GWOSC
data in the fetch_open_data()
method; to use it we
need to first import the TimeSeries
object:
from gwpy.timeseries import TimeSeries
then call the fetch_open_data()
method, passing it the
prefix for the interferometer we want ('L1'
here for LIGO-Livingston),
and the GPS start and stop times of our query (based around the GPS time
for GW150914):
data = TimeSeries.fetch_open_data("L1", gps-5, gps+5)
and then we can make a plot:
plot = data.plot(
title="LIGO Livingston Observatory data for GW150914",
ylabel="Strain amplitude",
color="gwpy:ligo-livingston",
epoch=gps,
)
plot.show()

We can’t see anything that looks like a gravitational wave signal in these data, the amplitude is dominated by low-frequency detector noise. Further filtering is required to be able to identify the GW150914 event here, see Filtering a TimeSeries to detect gravitational waves for a more in-depth example of extracting signals from noise.
Total running time of the script: (0 minutes 0.160 seconds)