asca data.
Data taken in LOW bit-rate can be used.
Although hot and flickering pixels completely saturate the portion of telemetry devoted to SIS data, LOW bit-rate GIS data are not affected in this way there is no reason to exclude them for spectral work. Note, however that the telemetry limit is low, at 4 count/s/GIS. This will be important only if accurate fluxes are required and for temporal analysis. Telemetry saturation will not affect spectral shapes and images, but the normalization (flux) will be reduced.
To obtain the correct flux, a correction will be needed for the electronic deadtime.
GIS deadtime will become important for sources with 10 cts/s/GIS. To carry out the deadtime correction, the FTOOLS deadtime (for spectra; see §8.11) and ldeadtime (for light curves; see 9.8) can be used.
