  Wide-Field MAXI (WF-MAXI: Wide-Field Monitor of All-sky X-ray Image) is a
proposed mission to detect and localize X-ray transients including
electro-magnetic counterparts of gravitational-wave events such as gamma-ray
bursts and supernovae etc., which are expected to be directly detected for the
first time in late 2010's by the next generation gravitational telescopes such
as Advanced LIGO and KAGRA. The most distinguishing characteristics of WF-MAXI
are a wide energy range from 0.7 keV to 1 MeV and a large field of view (~25 %
of the entire sky), which are realized by two main instruments: (i) Soft X-ray
Large Solid Angle Camera (SLC) which consists of four pairs of crisscross coded
aperture cameras using CCDs as one-dimensional fast-readout detectors covering
0.7 - 12 keV and (ii) Hard X-ray Monitor (HXM) which is a multi-channel array
of crystal scintillators coupled with avalanche photo-diodes covering 20 keV -
1 MeV.
