The SWIFT BAT Software Guide Version 6.3 30 ... - HEASARC - Nasa

40 CHAPTER 5. BAT ANALYSIS PROCEDURES
5.6.4 Plot the Light Curve
You can plot the light curve with ‘fplot’ or ‘fv’. Example:
fplot onesec.lc offset=yes
X column = TIME
Y column = RATE[ERROR]
you will have to adjust the X range to see the burst since there are large amounts of extraneous
data included by the SDC. For example: r x -100 3000 zooms on the first 3000 seconds
If the trigger time (TRIGTIME) keyword is present in the light curve file, then it is convenient
to plot the light curve after subtracting this time as an offset. It is easiest to do this with the ‘fv’
task. Run ‘fv’ on the light curve file and select ‘Plot’. For the X value, type TIME - TRIGTIME and
the trigger time will be placed at the origin of the plot.
Figure 5.3: Result of plotting the one second light curve of GRB 050713A in fv.
5.6.5 Changing the Energy Binning
You can choose different energy bins using the ‘energybins’ parameter to the task. Give any energy
range ELOW to EHIGH as “ELOW-EHIGH”. Be sure to use an energy range appropriate to the
BAT (within 14-200 keV).