This dataset contains all the data obtained by the Monitor of All-sky X-ray Image (MAXI) onboard ISS/JEM Exposed Facility (EF). Under the obs/ directory, event data are put into a directory of every 1000 days (MJD5xxxx/), and then each day (MJDxxxxxx/). The directory of each day has events/ and auxil/ directories, which contain event files and auxiliary files for attitude, orbit, time, ISS data, GSC time data, MKF, HK etc. The directory events/ has 3 directories, gsc_med/ gsc_low/ ssc_med/ for GSC and SSC, for bit rate low/med. Daily events are divided into 768 files, corresponding to each HEALPix region of the all sky.

The SSC is composed of horizontal (SSC-H) and zenithal (SSC-Z) arrays, therefore within a day there two sets of the 768 tiles: one for the H array and one for the Z array. The GSC is composite by 12 counters that are merged when creating the cleaned event files. Also for the GSC there are two sets of the 768 tiles: one for the low bit rate and one for the medium bit rate. If a tile does not contain events, the file for that specific tile is not created. Therefore within a day is possible that not all the tiles are present in each of the SSC or GSC data set.

Data Download

Users usually need MAXI data from a small part of the sky for a limited observation period. You can use mxdownload_wget for that purpose. Please see the Data Analysis page for details.

Request for using this data

MAXI users are courteously requested to acknowledge in any resulting publications, as follows:

“This research has made use of MAXI data provided by RIKEN, JAXA and the MAXI team.”

and to 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) [doi:10.1093/pasj/61.5.999]

MAXI team does not guarantee any results obtained from using the MAXI data and tools. When you change MAXI tools, please indicate that changes are made.