National Aeronautics and Space Administration

EDS Configurations: Standard-1

• Packaging of science data
• Time and energy resolution
• Reduction requirements and options
• Gain and offset
• Other features

The Standard-1 configuration is a type of binned mode which is run for all observations. The resulting files containing Standard-1 data are thus in science array format. The science data occupy the first, XTE_SA extension and comprise five columns of time histograms ("mini light curves"), one for each PCU, accumulated every 128 seconds and combined from all 256 channels. The histograms themselves have a step size of 0.125 seconds and are accumulated from "good" xenon events (i.e. those which survive background rejection). The columns containing the time histograms are preceded by the Time column which gives the time of the start of each 128-second accumulation.

The columns containing the science data are called XeCntPcu0, XeCntPcu1, XeCntPcu2, XeCntPcu3 and XeCntPcu4 (the ftool flcol will display column names). The histograms contain 1024 steps.

In addition to the time histograms, Standard-1 files also contain 256-channel spectra from the internal calibration source, accumulated every 128 seconds. There are 30 columns of calibration spectra, one for each signal chain (the five PCUs have six signal chains each). And in common with other configurations in science array format, Standard-1 files have two additional columns called Spillage and ModeSpecific, as well as a coda of keywords summarizing EDS status.