Karsten Danzmann

Abstract: We report the results of the first joint observation of the KAGRA detector with GEO 600. GEO 600 and KAGRA performed a joint observing run from April 7 to 20, 2020. We present the results of the joint analysis of the GEO–KAGRA data for transient gravitational-wave signals, including the coalescence of neutron-star binaries and generic unmodeled transients. We also perform dedicated searches for binary coalescence signals and generic transients associated with gamma-ray burst events observed during the joint run. No gravitational-wave events were identified. We evaluate the minimum detectable amplitude for various types of transient signals and the spacetime volume for which the network is sensitive to binary neutron-star coalescences. We also place lower limits on the distances to the gamma-ray bursts analysed based on the non-detection of an associated gravitational-wave signal for several signal models, including binary coalescences. These analyses demonstrate the feasibility and utility of KAGRA as a member of the global gravitational-wave detector network.

TL;DR: In this article, the authors present results from the direct measurement of thermal noise in mirrors mounted in the 10 m interferometer in Glasgow which has a sensitivity limit of 4 × 10 −19 mH z −1/2 above 1 kHz.

TL;DR: This work measured differential phase noise for a ytterbium-doped fiber amplifier emitting up to 2 W for the interferometric gravitational-wave detector Laser Interferometer Space Antenna, and found it within its requirement.

TL;DR: The results of a search for short and intermediate-duration gravitational-wave signals from four magnetar bursts in Advanced LIGO's second observing run were presented in this paper. But they found no evidence of a signal and set upper bounds on the root sum squared of the total dimensionless strain.

TL;DR: This work describes quantitatively the relative power transferred out of the fundamental mode into higher-order modes by surface irregularities or index inhomogeneities inside components traversed by the beam.