Examination of the lightcurve shows that there are two noisy sections, one between 9.6405e7 and 9.6413e7 seconds, and another between 9.6422e7 and 9.6425e7 seconds. Both show rates well in excess of the normal background count rate of 0.05 count/second. There are two procedures that make the GTI file (gtibuild and tabgtigen) that, when applied to the event file in another run of rgsproc, will excise these sections.
The first method, using gtibuild, requires a text file as input.
This file can be made on your local machine and uploaded to your Hera
account by right-clicking and dragging the file from your local directory
to the remote directory.
In the first two columns, refer to the start and end times (in seconds) that
you are interested in, and in the third column, indicate with either a +
or - sign whether that region should be kept or removed. In the example case,
then, we would write in our ASCII file (named r1_gti.txt):
9.6405e7 9.6413e7 -
9.6422e7 9.6425e7 -
and proceed to the task gtibuild.
To make the GTI with gtibuild in the GUI:
To make the GTI with gtibuild in the Command Window, type:
The task tabgtigen applies a filtering expression to the event file, limiting either the rates or the times, to produce the GTI.
To make the GTI with tabgtigen in the GUI:
To make the GTI with tabgtigen in the Command Window, type: