The Monitor of All-sky X-ray Image (MAXI)
is the first experiment to be installed on the Japanese Experiment Module
Exposed Facility (JEM-EF or Kibo-EF) on the International Space Station (ISS),
and the first high energy astrophysical experiment placed on the space station.
MAXI was launched with the Kibo Exposed Facility on the space shuttle
Endeavour (STS-127) on July 15, 2009 and delivered to the ISS. MAXI
started observations in August 2009 and was originally intended for a two
year operations period, but they were extended and approved through March 2021.
Lifetime : August 2009–present
Energy Range : 0.5–30 keV
Special Features : all-sky survey over each ISS orbit;
provide rapid detection of transients and variable sources.
Gas Slit Cameras (GSC) consist of 12 xeon-filled proportional gas
counters sensitive to 2–30 keV energy range.
Slit collimators give the GSC a 1.5° x 160° wide
field of view in each of the horizontal and zenithal directions
Solid-state Slit Cameras (SSC) consist of one dimensional position sensitive
X-ray detector (CCDs) sensitive to 0.5–12 keV energy range. The collimating slit aperature providing a narrow field of
view (1.5° by 80°) in the horizontal
(ISS forward motion) and vertical (zenithal) directions.
MAXI includes also a Radiation Belt Monitor to monitor radiation events
Monitoring of a variety of variable and transient X-ray sources
Rapid locating of burst events such as novae, supernovae, and gamma-ray
bursts found initially by other observatories, refining their sky locations
Discovery of numerous X-ray transient sources including black
hole candidates and new soft gamma-ray burst sources.
Transient event alerts: alerts to other observatories are distributed within
30 s of detection.
Archive: The HEASARC hosts event data, and calibration files for MAXI.