Old email and notes regarding
calibration data processing
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email from Derek Hullinger, Sat Oct 25, 2003 10:58:20 PM US/Eastern
The fits files that contain the 32K spectra, gain corrected, are
found on gcn4 in the directory:
/local/data/gcn4a/array_cal/coarse_grid/full_array There are several
examples, all ending with the extension ".full_array".
The code used to create these files is on gcn3 in the directory:
/local/data/gcn3a/battools/src/full_rebin It is called full_rebin.cpp.
There are three sections of the code where
the fits file is actually written. These three sections all begin with
a
line like this:
//-start
and end with a line like this:
//-stop
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email from Derek Hullinger, Sat Oct 25, 2003 11:59:29 PM US/Eastern
I've looked through the gcn3a and gcn3c directories and it looks
like there is Co-57 data for a total of 10 positions--6 are coarse grid
runs and 4 are far field runs.
I've summed up the spectra for 5 of the coarse grid positions and they
are on gcn4 in /local/data/gcn4a/array_cal/coarse_grid/sum_array, along
with the distributions that go with them. The data for each position is
still split up into 3 files--each containing the summed spectra for a
third of the detectors. Ann was right--we need to combine them so we
can fit all the detectors together. Since the spectra are
"renormalized" by dividing them by (1/2*sum(maskwt^2)), combining them
will require something just a little bit more sophisticated than simply
adding them together, or even adding them together and dividing by
three.
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