Spitzer data can be downloaded from the Spitzer Heritage Archive. Table 6.1 lists the classes of data products that are available. After downloading the data from the archive, the user will end up with a directory tree, the top level of which will have the AORKEY number, prefixed by an "r". The AORKEY uniquely identifies a single Spitzer observation sequence, which is called an Astronomical Observation Request, or AOR. Within this directory, there will be one subdirectory for each module used in the AOR. The possible subdirectory names are ch0/, ch1/, ch2/ and ch3/, which correspond to the Short-Low (SL), Short-High (SH), Long-Low (LL) and Long-High (LH) modules, respectively. Peak-Up Acquisition or Imaging data, if taken, will also be found in the ch0/ subdirectory. Within each module subdirectory there may be bcd/, pbcd/, cal/, and/or raw/ subdirectories, depending on which classes of data were selected for download.
Table 6.1 Classes of Spitzer data products.
Event for which files are provided
The raw three dimensional data files.
Files that were used to calibrate the data.
Basic Calibrated Data
The primary calibrated data frames that emerge from the Spitzer pipeline.
Ancillary Level 1
Ancillary Basic Calibrated Data
Additional calibrated data frames that emerge from the Spitzer pipeline.
The primary products that come from combining individual BCDs.
Ancillary Level 2
Additional products that come from combining individual BCDs.