FITS files of CONTENT set to BASIC, or extensions with
the HDU keywords HDUCLASS and HDUCLAS1
set to OGIP and EVENT respectively will be accepted
by Asterix as event datasets. The field names will be the same as
those in the FITS file and map to existing Asterix event structures.
Most Asterix event processing applications would need some alteration
to operate efficiently on FITS event data, but a scheme has been
devised for doing this.
Instrument specific keywords in the primary header map are equivalent to identically named components in the Asterix instrument structure.