All-sky Observations with Suzaku Wide-band All-sky Monitor and MAXI

All-sky observation in wide energy band is important to study bright gamma-ray sources as well as other transient phenomena such as Gamma-ray Bursts (GRBs). Suzaku Wide-band All-sky Monitor (WAM) enables such all-sky observations up to soft gamma-ray band thanks to its wide energy coverage from 50 keV to 5000 keV with very large effective area of 400 cm even at 1 MeV. During five year operations, any serious detector problems have not come up and the WAM has successfully detected more than 750 GRBs. Simultaneous detection between the WAM and MAXI of GRB 090831A is an example of a GRB spectroscopy in wide energy range from a few keV to MeV. In addition, the WAM is monitoring many bright gamma-ray sources such as Crab and Cyg X-1 by utilizing the earth occultation technique. Cooperation between the WAM, MAXI, and other all-sky instruments enables us to compare the behavior of their light curves in X-ray and soft gamma-ray energy band.