Master thesis - UBC Physics & Astronomy

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36 M. Alexandersen : Master thesis Figure 18. The Swift XRT pattern definition. From Godet et al. (2009). This eventually led to an almost fully automatic IDL programme, which ties together many IDL procedures, as well as using other software such as F T OOLS and P erl script from within the IDL code. Once reduced, some of the methods mentioned in Sec. 5 can be applied to the data. 6.1. F T OOLS FTOOLS is a software package designed for general purpose manipulation of fits files and images. Before this project, I had never used or even heard of it, but after months of reading manuals accompanied with a lot of trial
M. Alexandersen : Master thesis 37 and error file reduction, I feel that I now have a firm understanding of how to use it, as well as what is possible and what is not. One challenge that I experienced with F T OOLS was the use of the, apparently, new F T OOLS extended filename syntax. When using the simple filename syntax, one can write something like: fselect infile.fits+1 outfile.fits "regfilter(’region.reg’)" thereby filtering a file using a region defined in a file. Using the extended filename syntax this could be written as: fcopy "infile.fits[1][regfilter(’region.reg’)]" outfile.fits Notice the quotation marks around the filename now. These are not present in all of the examples in the help files, for example the help file for fhist has no quotation marks. So for the first few weeks, I did not know that these were needed, and therefore could not make the extended filename syntax work. I finally noticed that there were quotation marks in the help file for fcopy, but by this time I had already learnt to use tools such as fselect, fcopy, fhisto, f2dhisto, fstruct, fstatistic and others with the old syntax. I now feel that I have a good understanding of the extended filename syntax as well. It allows a lot of clever uses of fcopy, allowing fcopy to replace several other tools, such as fselect and fhisto, or to perform filtering simultaneously with other operations. However I believe it is to my advantage that I also learnt to use the old syntax, as I now can recognise both syntaxes, especially considering that it is still the old syntax that is used in most of the help files for the different ftools. All in all the two different syntaxes are not really that different, and as can be seen above, the extended syntax for most operations does not even save characters. Most of my coding uses the old syntax, for several reasons. Firstly, I found it most intuitive to use while coding, and also because there are then often less apostrophes and quotation marks, making the code more easily readable, as there is already a lot quotation marks from combining strings of text with string variables, and from the use of SP AW N,
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Figure 42. DDD for 10 GRBs. M. Alex
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Master thesis - UBC Physics & Astronomy

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