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Three short-cuts are located in the top page. They are direct links to Source list, Light curves, All sky map search and on-demand data process.
Three searching systems are available.
1.All sky map search : You can click a point in the daily all-sky map to find monitor sources.
2.Name search : You can find a listed source by name.
3.Coordinate search : You can find a listed source by the coordinate.
First, select a category to get thumbnails of light curves. Click a thumbnail to jump to the source data.
All the monitored sources are listed.
The light curves are in three and the total bands in the unit of ph/s/cm2 since the start of the MAXI observation (UT date=2009/8/15, MJD=55058). The data of 1-day bin or 1 orbit ( 90-minute) bin can be interactive-plotted or downloaded through the download tabs. The file-format is "MJD, 2-20 keV, error, 2-4 keV, error, 4-10 keV, error, 10-20 keV, error". The Crab spectrum is assumed in the efficiency correction for each band. Therefore generally the value in 2-20 keV is not equal to the sum of the three bands.
1 Crab equals 3.6 ph/s/cm2 in the total band, and
1.87, 1.24, 0.40 ph/s/cm2 for 2-4, 4-10, 10-20 keV band, respectively.
The image is that of the last one-day in the total and 3 energy bands. The MJD can be specified by typing in the tab. Also day, week, month images can be selected.
Sequential lack of data points may be due to the source location close to the Sun, near scan poles, or a down time for a system maintenance.
The data may contain some bad-quality points, which may exhibit flare-like profiles for unexpacted background increase or dip-like profiles for a shadow of solar-battery paddles. The flux in the 2-4 keV band has a larger uncertainty for an unsufficeint calibration of window absorption (see Crab light curve). The process of data reduction and the calibration of instrument responses are still in progress. These problems will be improved. The data may be modified/updeted without any previous notice.
MAXI observation field of views were sometimes obstructed by the Space Shuttle when the vehicle was docked on the space station (2009/8/31-9/8, 11/18-25, 2010/2/10-20). These down time has not been taken into account.
The data is updated every day. The data with the process version 0.8 are updated in every 4 hours.
When you use the data, please do it with your own risk.
When you publish a scientific paper utilizing the MAXI data, please acknowledge as
"This research has made use of the MAXI data provided by RIKEN, JAXA and the MAXI team."
and please cite the paper:
"The MAXI Mission on the ISS: Science and Instruments for Monitoring All-Sky X-Ray Images"
Matsuoka, M. et al., PASJ, 61, 999 (2009)
2011.12.5. One Crab numbers are written. (Mihara)
You have a question about MAXI, please contact us via the Contact Form.