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tabgtigen
August 15, 2005
Abstract
Create Good-Time-Intervals from table data
1 Instruments/Modes
EPIC MOS : ALL
EPIC PN : ALL
RGS : ALL
OM : ALL
2 Use
pipeline processing yes
interactive analysis yes
3 Description
The purpose of tabgtigen is to produce Good Time Intervals (GTIs) for data processing based on the
time history of the housekeeping and other periodic data. The user species what data les to use and
what ltering criteria to use. The ltering criteria take the form of a boolean expression, with table
column names being used as the variables in the expression. If for a given row in a data set the boolean
expression evaluates to true, then the time for this row is included in the determination of the GTIs. The
output consists of one GTI le. The GTI list will be valid only for those ranges of time covered by all
input data les.
For a description of the syntax rules the boolean selection expression must adhere to, please consult the
documentation of the SAS package selectlib.
Please note: Many of the available operators and functions which can be used in the selection expression
have merely limited applicability in the case of tabgtigen (e.g. region selection lters). This functionality,
however, is available \for free" since it comes from the selectlib package which tabgtigen is based on.
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4 Parameters
This section documents the parameters recognized by this task (if any).
Parameter Mand Type Default Constraints
table yes name of
existing
table
input table specier
a table specier which must point to a table in a data set. It must be in either of the three forms setname,
setname+tableid or setname[tableid] where setname must be the name of an existing data set and
tableid an identier of a table in that data set. If the rst form, setname, is used, the table data are
sought in the rst block of the named data set. tableid can either be an identier starting with a letter
which must then be the name of a table in the specied data set or a simple number which is directly
interpreted as a block sequence number (starting from 1).
expression yes string valid boolean ex-
pression according to
above syntax rules
the boolean expression controlling the creation of the GTI le
gtiset no table
specier
gti.ds:ALLGTI none
The name of the resulting output GTI table - can be the name of an already existing table (which will
get overwritten) or the name of a new one in an existing or new data set.
timecolumn no string TIME name of existing col-
umn
name of the column in the input data set containing the time stamps
prefraction no real 0.5 -1.0{1.0
the fraction of the previous time interval to be included in the current GTI. A value of 1.0 means to
include the whole interval. The default is to take half of the time interval as if the state change occurred
between the sample instants. Please note: For the adjustment of the very START time there is no pre-
vious time interval to consider - the subsequent one is taken instead.
postfraction no real 0.5 -1.0{1.0
the fraction of the subsequent time interval to be included in the current GTI. A value of 1.0 means to
include the whole interval. The default is to take half of the time interval as if the state change occurred
between the sample instants. Please note: For the adjustment of the last STOP time there is no following
time interval to consider - the previous one is taken instead.
mingtisize no real 0 >= 0
The output GTI table shall not contain GTIs with durations less than this limit. Its value shall be
echoed in attribute MINGTISZ together with a new attribute SUMSHORT (the sum of all GTIs shorter than
mingtisize).
5 Errors
This section documents warnings and errors generated by this task (if any). Note that warnings and
errors can also be generated in the SAS infrastructure libraries, in which case they would not be docu-
mented here. Refer to the index of all errors and warnings available in the HTML version of the SAS
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documentation.
There are no task-specic errors or warnings, i.e. all possible errors or warnings come from the used
infrastructure libraries selectlib, dal, or param.
6 Input Files
1. Periodic HK type data les (as produced by HKSTRIP).
2. EPIC MOS HK data (from EPIC MOS Periodic Housekeeping File).
3. EPIC p-n HK data (from EPIC p-n Periodic Housekeeping File).
4. RGS p-n HK data (from RGS p-n Periodic Housekeeping File).
5. OM HK data (from OM Periodic Housekeeping File).
6. OM non-Periodic HK data (from OM non-Periodic Housekeeping File).
7. ERM data (from ERM Count Rate File).
8. Spacecraft Attitude data (from Spacecraft Attitude History File).
9. Spacecraft HK data (from Spacecraft Periodic Housekeeping Files).
7 Output Files
1. OGIP compliant GTI FITS le (for input to evselect) with additional attributes MINGTISZ
(value of mingtisize parameter), SUMSHORT (sum of GTIs shorter than mingtisize).
8 Comments
None.
9 Future developments
None.
References
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