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

48 CHAPTER 5. BAT ANALYSIS PROCEDURES
– a basic map can be found in obsid/bat/hk/swNNNNNNNNNNNbcbdq.hk.gz;
– one can be created by using the “Creating a Quality Map” procedure;
Swift attitude information (in obsid/auxil/swNNNNNNNNNNNsat.fits.gz).
For example, let’s assume we are interested in the burst GRB 050713A, in particular to produce
an image of the “flare” from time 142921843 (MET) to 142921868 (MET).
5.8.3 Change into Event Directory
Change directories to the location of the event data.
cd 00145675000/bat/event
5.8.4 Make a Detector Plane Image
A Detector Plane Image (DPI) is a map of the counts (or count rate) in each detector as it is layed
out geographically in the detector plane. This map is the input to the deconvolution software.
Issue the following command,
batbinevt infile=sw00145675000bevshsp_uf.evt.gz outfile=flare.dpi outtype=DPI \
timedel=0.0 timebinalg=u tstart=142921843 tstop=142921868 \
energybins=14-150 outunits=RATE weighted=NO ecol=ENERGY \
detmask=../hk/sw00145675000bcbdq.hk.gz clobber=YES
where
• outtype=DPI means to make a DPI
• timedel=0.0 means accumulate all the data into one single DPI
• timeginalg=u means make them uniform time bins (really “don’t care” in this case)
• the tstart and tstop give the start and stop time of the spectrum as discussed above
• the energybins=14-150 means make a single image in the 14-150 keV range
• the ecol=ENERGY means use the ENERGY column for energy selections
• the outunits=RATE makes a rate image
• the weighted=NO means do not perform background subtraction
• the detmask is required to filter out noisy detectors
The result should be a single detector plane image. It is also possible to select multiple time
ranges or multiple energy bands. batfftimage will automatically process these to produce sky images
in multiple slices.