Title：Study of calibration uncertainty estimation for worldwide gravitational wave observation 4 and future
Time：2023/12/20 (Wed.) 12:30
Place：4F Lecture Hall, Cosmology Hall, NTU

Abstract：
The first direct detection of gravitational waves was achieved by the Laser Interferometer Gravitational-Wave Observatory (LIGO) in 2015. LIGO, comprising two detectors located in Hanford and Livingston in US, employs laser interferometry to detect gravitational waves. The initial observation successfully detected gravitational waves emitted during the merger of two black holes. Subsequently, LIGO and Virgo have observed 90 gravitational wave events in previous observations. In May 2023, LIGO, Virgo, and KAGRA initiated the worldwide gravitational wave observation 4. At the beginning of observation 4, LIGO achieved an averaged sensitivity of approximately 150 Mpc for the detection of binary neutron star signals. To minimize systematic uncertainty, we have contributed to the calibration and reconstruction study in this observation. This presentation aims to provide an overview of the current status of the calibration study and discuss future in LIGO.