5. Concatenating observations
A FOT contains data from one OP (Observing Period)
-
An OP is defined essentially as one continuous time interval with
constant pointing, or a slew manouvre. Non-classifiable intervals are named contingency OPs)
A FOT usually contain a single normal OP plus the preceding and following slew OPs if applicable.
In turn each OP can be divided in a number of finer time intervals called
observations.
-
An observation boundary (change) occurs whenever the instrument configuration is modified by
a telecommand (or of course at an OP boundary)
The names of observing period and observations used for SAX are mutuated from
EXOSAT.
The equivalent names for
XMM
have later been changed to observation and exposure, respectively.
Of course only observations in the same or compatible configuration can be concatenated
together. Before proceeding to concatenation, one shall check the instrument configuration.
The following procedure is recommended.
sax.iasf-milano.inaf.it/Xashelp/observ.html
:: original creation 2002 Sep 04 17:42:03 CEST ::
last edit 2002 Sep 04 17:42:03 CEST