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

5.6. LIGHT CURVE FROM EVENT DATA 39
Figure 5.2: Schematic diagram of binning event data using the batbinevt task. It can be used to
create light curves, as well as spectra and images.
We will use the original event list of GRB 050713A as an example (obsid 00145675 000). The
event data should have been ray-traced by the SDC using the position of the GRB. Energy calibrations
should also have been applied. See the Mask-Weighting and Energy Correction threads
for more information.
5.6.2 Change into Event Directory
Change directories to the location of the event data.
cd 00145675000/bat/event
5.6.3 Make the light curve
BAT light curves are made with the ‘batbinevt’ task. Here is an example:
batbinevt infile=sw00145675000bevshsp_uf.evt.gz outfile=onesec.lc outtype=LC \
timedel=1.0 timebinalg=u energybins=15-150 \
detmask=../hk/sw00145675000bcbdq.hk.gz clobber=YES
• the infile is the input events file
• the outifle is the output light curve
• the outtype=LC means make a “light curve”
• the timedel=1.0 means make 1 second time bins
• the timebinalg=u means make them uniform bins (instead of variable sized bins)
• the energybins=15-150 means make a 1-channel light curve from 15-150 keV
• the detmask is required to filter out noisy detectors