Setting up the analysis data

In order to set up a proper environment, you first have to create an analysis directory (e.g ibis_data_rep) and ``cd'' into it:

mkdir ibis_data_rep
cd ibis_data_rep

This working directory ibis_data_rep will be referred to as the ``REP_BASE_PROD'' directory in the following. All the data required in your analysis should then be available from this ``top'' directory, and they should be organized as follows

• scw/ : data produced by the instruments (e.g., event tables) cut and stored by ScWs;
• aux/ : auxiliary data provided by the ground segment (e.g., time correlations);
• cat/ : ISDC reference catalogue (OSA_CAT package);
• ic/  : Instrument Characteristics (IC), such as calibration data and instrument responses (OSA_IC package);
• idx/ : set of indices used by the software to select appropriate IC data (OSA_IC package).

The cat/, ic/ and idx/ directories are part of the OSA software distribution and should be installed following the ``INTEGRAL Off-line Scientific Analysis Installation Guide'' [5]. The actual data along with the auxiliary files (scw/ and aux/) are sent to the Principal Investigators of the observation. Alternatively, the public data can be downloaded from the archive (see Section ). In case the data are already available on your system you can either copy these data to the relevant working directory, or better, create soft links as shown below. Alternatively, if you do not have any of the above data on your local system, or if you do not have a local archive with the scw/ and the aux/ branch available, follow the instructions in the next section to download data from the ISDC WWW site.

ln -s directory_of_ic_files_installation__/ic ic
ln -s directory_of_ic_files_installation__/idx idx
ln -s directory_of_cat_installation__/cat cat
ln -s directory_of_local_archive__/scw scw
ln -s directory_of_local_archive__/aux aux

Then, just create a file ``isgri_gc.lst'' containing the 5 lines:

005100410010.001
005100420010.001
005100430010.001
005100440010.001
005100450010.001

and a file ``picsit.lst'' containing:

003900020020.001
003900020030.001
003900020040.001
003900020050.001
003900020060.001

The created files contain the list of ScWs you want to analyze. Various formats of the science window list can be used, as can be seen by reading the output of the command og\_create --help. These are e.g. scw/0039/003900020060.001/swg.fits or 003900020060.001, or 003900020060.

These file names `isgri_gc.lst' and `picsit.lst' will be used later as an argument for the og_create program (see Sections , ).