# New data release: O3 auxiliary channels

**URL:** <https://ask.igwn.org/t/new-data-release-o3-auxiliary-channels/470>\
**Category:** Data Analysis\
**Tags:** news\
**Created:** [March 10, 2023, 10:58pm UTC](https://ask.igwn.org/t/new-data-release-o3-auxiliary-channels/470 "2023-03-10T22:58:49Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![jonah](https://yyz1.discourse-cdn.com/flex031/user_avatar/ask.igwn.org/jonah/32/10_2.png) [@jonah](https://ask.igwn.org/u/jonah)\
**Post date:** [March 10, 2023, 10:58pm UTC](https://ask.igwn.org/t/new-data-release-o3-auxiliary-channels/470/1 "2023-03-10T22:58:49Z")

</div>

## New data release: O3 auxiliary channels

GWOSC has recently released a new type of data set!

The LIGO instrument at each site uses a large number of sensors to track  
the state of both the instrument and the surrounding environment. A subset  
of those sensors (channels) are used as part of astrophysical analyses by  
the LIGO-Virgo-KAGRA collaboration. The particular subset of channels  
provided here has been used to remove additional noise from LIGO data or  
to improve the quality of the astrophysical analyses.

This data set includes 40 channels from LIGO Hanford and 46 channels from  
LIGO Livingston, that were used in O3 astrophysical analyses. The data set has  
a total size of 13 TB. This data set includes channels that were used to create  
data quality flags, to subtract instrumental noise from the strain data, and  
to measure the amount of correlated noise between the gravitational-wave  
detectors.

Learn more at: [gwosc.org/O3/auxiliary/](https://gwosc.org/O3/auxiliary)