RE: Disk 17 FITS headers/ CCDPROC

["Albertson, Chris" <CAlbertson@primeadvantage.com>]

Here is the reference:

"A User's Guide to CCD Reductions with IRAF"'
 Philip Massey, February 1997. 
ftp://iraf.noao.edu/pub/ccduser3.ps 

If you use the above method, given Tom's new FITS headers
all you have to do is point the "ccdproc" program at a
directory of mixed images, darks and flats and it will
"do the right thing" and sort the mess out building
and scaling master darks/flats as required.  The trick
is getting the headers right so this program can do its
work.  The above paper explains how to do that.

(Note to Tom, you have this file already.)




> -----Original Message-----
> From: Paul Repacholi [mailto:prep@prep.synonet.com]
> Sent: Saturday, April 07, 2001 11:42 AM

> 
> Better to scale by the header exposure time, subject to sanity checks.
> Some where in the IRAF related papers there is a very good paper on
> reducing CCD data sets. I'll have to see if I can find it, and post
> the URL.