![]() ![]() Only need to type the file name as part of the ds9 command line. To do this, set the environment variable DS9_BINKEYĮqual to. This a lot and do not want to have to type "" at the end ofĮach file name, it is possible to make this default action forĭs9. In this case we've chosen to make a map in Right AscentionĪnd Declination, but you could use galactic coordinates ( ) or Names of the columns to use for the x and y coordinates of the data toīin. 3C279_region_filtered_gti.fits - The first part is just the filename containing theĮvents you want to bin up.If left off, the default scale is linear. Again this is the author's personal preference for this Maxima, where there is a bright source in the field as is the case This particular scale helps to accentuate faint -scale sqrt - Tells ds9 to scale the colormap using the square root of the counts in.This isĬompletely optional and the choice of map "b" represents the personal -cmap b - Tells ds9 to use the " b" color map to display the image.So if you leave this off the command line you will get 1 degree bins Since we will be binning on the coordinates ( RA, DEC), -bin factor 0.1 0.1 - Tells ds9 that the x and y bin sizes are to be 0.1 units in eachĭirection.Prompt> ds9 -bin factor 0.1 0.1 -cmap b -scale sqrt "3C279_region_filtered_gti.fits"Ī ds9 window will open up and an image similar to the one shown below will be displayed.īreaking the command line into its parts, we find that: To see the data, use ds9 to create a quick counts maps of the events in the file.įor example, to look at the 3C279 data file, enter the following command: First, we'll look at making quick counts maps with ds9 then we'll perform a more in depthĮxploration of the data using fv. Ways to explore the data and make quick and dirty plots and graphs of In this section we look at several different There is no need to select event classes for bursts, as you will need all three event classes to gain statistics. This generates a data file from 500s before to 1500 seconds after the trigger time of the burst. Note: The grb_events.fits and grb_spacecraft.fits files were selected from the FSSC's LAT data server using the following criteria: grb_spacecraft.fits (52 kB) - the spacecraft data file for GRB 080916C. ![]()
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