The GRBM data are available in two different formats and organizations: the FOT and the RAW data. The latter are archived orbit by orbit and are identified through the orbit number; they are the input of the on-line data analysis, because, differently from the former (not available within 4-5 days), they become available just a few hours after they have been taken aboard. The FOT data, constituing the GRBM archive in its final format, are described below.