Current gravitational-wave astronomy
Up-to-date information on gravitational-wave astronomy and expertise at the Max Planck Institute for Gravitational Physics in Hannover and Potsdam.
Next observing run: O4
LIGO, Virgo, and KAGRA are closely coordinating to start the O4 observing run together. The start of O4 is planned for March 2023. An engineering run is expected to start one month before the observing run; low-latency alerts for candidate events identified during engineering time may be released, both to exercise the system and to preserve the scientific value. (information as of June 2022)
LIGO projects a sensitivity goal of 160-190 Mpc for binary neutron stars. Virgo projects a target sensitivity of 80-115 Mpc. KAGRA should be running with greater than 1 Mpc sensitivity at the beginning of O4, and will work to improve the sensitivity toward the end of O4.
“LIGO/Virgo public alerts” during observing runs
In O3, possible transient gravitational-wave signals (candidates for binary merger signals) identified by the LIGO Scientific and Virgo Collaboration researchers were made public in near real time. Data about the candidate, such as type of signal, sky position and estimated distance were published as part of these “alerts”. Professional and amateur astronomers could schedule follow-up observations of gravitational-wave signals based on this information.
Last observing run: O3 (April 2019 - March 2020)
On 1 April 2019, the twin LIGO instruments, the Virgo detector, and the GEO600 instrument began their third observing run “O3”. KAGRA joined at the end of the run. The detectors’ sensitivities had been further increased in the months before and in previous engineering runs.
In October 2019 after the first half of O3 (called O3a), data taking was interrupted for a full month for maintenance and upgrades at the detectors. The second half of O3 (called O3b) was planned to conclude on 30 April 2020, but was finished already on 27 March 2020 due to the Covid-19 pandemic.
Highlights from O3
LIGO Scientific Collaboration departments and research groups at AEI
LIGO Scientific Collaboration researchers at the Max Planck Institute for Gravitational Physics in Potsdam and Hannover and at the Leibniz Universität Hannover are leading partners in the international gravitational-wave community.