Separate GSO and PIN Events

HXD event files have both GSO and PIN events. An X-ray event can hit only a single detector (either GSO, PIN0, PIN1, PIN2 or PIN3) in a single Well-unit at a time, and the the UNIT_ID and DET_TYPE columns tell the unit ID and detector type for each event (p. ).

To carry out a spectral analysis, GSO and PIN events have to be separated (spectral responses are completely different), where these events might be combined to make a light curve.

All the GSO sensors are considered to have almost identical characteristics, so are the PIN detectors. Therefore events from the 16 GSO sensors can be combined to make GSO spectra; the same for 64 PIN sensors to make PIN energy spectra.

To select only GSO events:

     select event "DET_TYPE==0"

Or, to select only PIN events:

     select event "DET_TYPE==1||DET_TYPE==2||DET_TYPE==3||DET_TYPE==4"

Please remember that GSO and PIN event selections are exclusive. Therefore, if you are going to extract GSO and PIN energy spectra from the same event file, you will need clear select to reset after the first event selection.