NAME

fltime -- Filters a FITS table by selecting only the rows that have a time stamp within an specified set of time intervals.

USAGE

        fltime infile[ext#] gtifile outfile

DESCRIPTION

This task selects rows from in input FITS table and writes them to an output table if the time stamp for that row falls within one of an input set of "Good Time Intervals" (GTIs).

PARAMETERS

infile [file name]

The name and extension number in square brackets of the input FITS table extension containing the list of events to be filtered.

gtifile [file name]

The name of the Good Time Interval FITS file to be used to filter the input table. This is a FITS table or bintable extension which contains 2 columns defining the start and stop times of a set of Good Time Intervals. The column values in this table are given in units of seconds relative to a start time specified in the extension header (see the description of the obsdate and obstime parameters).

outfile [file name]

The name of the output "filtered" FITS table containing the selected events from the input file. This table will contain the same number and order of columns contained in the input table. If the copyall parameter is set equal to 'no' then this FITS file will consist of a null primary array followed by a table or bintable extension (depending on the type of the input extension). If copyall equal yes, then the primary array and any other extensions in the input file will also be copied to the output file.

(column = TIME) [string]

The name of the column in INFILE that contains the time stamp value that is used to determine if that row falls within one of the input Good Time Intervals. The values in this column should be in units of seconds relative to the start time specified by the obsdate and obstime keywords in the header of the extension.

(obsdate = MJDREF) [string]

The name of the keyword containing the reference date in the input events table. The value can either be blank (or "-") to defeat the reference checking, in julian days or in 'dd/mm/yy' format.

(obstime = ) [string]

The name of the keyword containing the reference time in the input events table in 'hh:mm:ss.ddd' format. This parameter is only used if obsdate is in dd/mm/yy format.

(gticols = START,STOP) [string]

The name of the columns in GTIFILE containing start and stop times.

(gtidate = MJDREF) [string]

The name of the keyword containing the reference date in the input GTI table. The value can either be blank (or "-") to defeat the reference checking, in julian days or in 'dd/mm/yy' format. It must have the same format as the obsdate parameter.

(gtitime = ) [string]

The name of the keyword containing the reference time in the input GTI table in 'hh:mm:ss.ddd' format. This parameter is only used if obsdate is in dd/mm/yy format.

(exposure = EXPOSURE) [string]

The name of the keyword containing the exposure time in the input and output FITS file. If the keyword doesn't exist it will be created.

(copyall = no) [boolean]

If YES, then the task will copy the primary array and any other extensions from the input event file to the output file.

EXAMPLES

1. Filter the second extension in a FITS file named events.fits using a GTI file named gti.fits and place filtered results in the FITS file out.fits. All other parameters take on their default values.

     
             ft> fltime events.fits[2] gti.fits out.fits 
     

2. Filter the first extension in a FITS file named events.fits using a GTI file named gti.fits and place filtered results in the FITS file out.fits. The COPYALL flag is set to yes, thus copying the primary array and any other extensions in the input file to the output file.

     
             ft> fltime events.fits gti.fits out.fits COPYALL=yes

BUGS

SEE ALSO

mgtime, maketime

CATEGORY