O3a Bulk Strain Data Release

News Release • April 17, 2021

Update April 30, 2021: The O3a bulk strain data has been released.

On 30 April 2021 the LIGO and Virgo collaborations plan to release bulk strain data taken during the first six months of O3. This is the O3a data release. It includes data taken between 1 April 2019 and 30 September 2019. We plan to release the remaining strain data from O3 later this year.

For more information about LIGO-Virgo data releases, visit