  Gravitational wave is a propagation of space-time distortion, which is
predicted by Einstein in general relativity. Strong gravitational waves will
come from some drastic astronomical objects, e.g. coalescence of neutron star
binaries, black holes, supernovae, rotating pulsars and pulsar glitches.
Detection of the gravitational waves from these objects will open a new door of
\textit{`gravitational wave astronomy'}. Gravitational wave will be a probe to
study the physics and astrophysics. To search these gravitational waves,
large-scale laser interferometers will compose a global network of detectors.
Advanced LIGO and advanced Virgo are upgrading from currents detectors. One of
LIGO detector is considering to move Australia Site. IndIGO or Einstein
Telescope are future plans. LCGT (Large-scale Cryogenic Gravitational wave
Telescope) is now constructing in Japan with distinctive characters: cryogenic
cooling mirror and underground site. We will present a design and a
construction status of LCGT, and brief status of current gravitational wave
detectors in the world. Network of these gravitational wave detectors will
start in late 2016 or 2017, and may discover the gravitational waves. For
example, these detectors will reach its search range for coalescence of neutron
star binary is over 200 Mpc, and several or more events per year will be
expected. Since most of gravitational wave events are from high-energy
phenomenon of the astronomical objects, these might have counterpart evidences
in electromagnetic radiation (visible light, X/gamma ray), neutrino, high
energy particles or others. Thus, the mutual follow-up observations will give
us more information of these objects.
