About

[calendar]
start-of-week = sunday
start-date = 2015-09-14

[state-H1-science]
key = H1-science
name = Observing
definition = H1:DMT-ANALYSIS_READY:1

[state-L1-science]
key = L1-science
name = Observing
definition = L1:DMT-ANALYSIS_READY:1

[tab-home]
type = link
name = _Home
url = https://losc.ligo.org/detector_status/

[tab-summary]
type = plots
name = Summary
foreword = The plots shown below characterize the sensitivity and
  status of each of the LIGO interferometers during the second observing run, which began on November 30, 2016 
  and ended on August 25, 2017.  
  For more information about the plots listed below, click on an image to read the caption.
1 = /s/summary_pages/detector_status/cache/O2/H1L1-OBSERV_OPEN_BEF2A0_NETWORK_DUTY_PIE-1164556817-23176801.png
1-caption = This pie chart shows the fraction of single and double interferometer observing time for the Hanford and Livingston detectors.
2 = /s/summary_pages/detector_status/cache/O2/H1L1-NETWORK_SEGMENTS-1164556817-23176801.png
2-caption = This plot shows the instrument status for the Livingston (L1) and Hanford (H1) detectors, as well as the coincident time where both detectors were operational, over the course of the day. The tall opaque blocks indicate times when the interferometer is intended to be in observing mode and no tests are currently being performed. The narrow transparent blocks indicate times when the interferometer was in an operational state, but not in observing mode. This state often means that testing or commissioning is in progress.
3 = /s/summary_pages/detector_status/cache/O2/H1L1-NETWORK_RANGE-1164556817-23176801.png
3-caption = This plot shows the average sensitivity of the Livingston (L1) and Hanford (H1) detectors to gravitational wave signals from binary neutron star mergers, as measured in megaparsecs (where 1 megaparsec = 3,262,000 light-years), averaged over all sky positions and source orientations. The value reported in this plot is determined by comparing the noise curve to a predicted gravitational wave signal from a binary neutron star merger. The sharp drops in this curve are typically due to transient noise in the interferometer limiting sensitivity to gravitational waves. 
4 = /s/summary_pages/detector_status/cache/O2/H1L1-MULTI_4B71CC_TIME_VOLUME-1164556817-23176801.png
4-caption = This plot shows the cumulative time-volume of the Livingston (L1) and Hanford (H1) detectors. This figure of merit multiplies the astrophysical volume that the detectors can observe by the amount of time spent observing, which allows LIGO scientists to calculate quantities such as the expected rate of gravitational wave signals.
5 = /s/summary_pages/detector_status/cache/O2/H1-OBSERV_OPEN_DUTY_FACTOR_SEGMENT_PIE-1164556817-23176801.png
5-caption = This pie chart shows the operational state of the H1 detector over the course of O2. 'Observing' indicates time when the detector was taking data for use in astrophysical analysis. 'Ready' indicates that the detector was operating, but the on-site operators were taking measurements and the data were not fit for analysis. 'Locked' indicates that the detector was operating, but the data were not properly calibrated. 'Not locked' indicates that the detector was not operational.
6 = /s/summary_pages/detector_status/cache/O2/L1-OBSERV_OPEN_DUTY_FACTOR_SEGMENT_PIE-1164556817-23176801.png
6-caption = This pie chart shows the operational state of the L1 detector over the course of O2. 'Observing' indicates time when the detector was taking data for use in astrophysical analysis. 'Ready' indicates that the detector was operating, but the on-site operators were taking measurements and the data were not fit for analysis. 'Locked' indicates that the detector was operating, but the data were not properly calibrated. 'Not locked' indicates that the detector was not operational.
layout = 2
afterword = This page is a product of the <a href='http://losc.ligo.org'>LIGO Open Science Center</a>. See <a href='http://ligo.org'>ligo.org</a> for more information.