Subject: Re: reducing GRIM imaging data

From: Brad

Submitted: Thu, 8 Mar 2001 19:25:30 -0600 (CST)

Message number: 47 (previous: 46, next: 48 up: Index)

Hi Vijay,

It has been about a year since I reduce any GRIM data, but I will
try to give useful advice.

First off, I have never found that I could use the offsets in
the headers to align my images.  Now, I never bothered guiding
either, but I would be wary of trusting them.

The package I used was DIMSUM (which has been IRAF-ified and is called
xdimsum).  DIMSUM creates a first pass image that does a good enough
job at sky subtraction for you to mark bright stars for alignment
purposes.

As for recent flats, readnoise values and bad pixel masks, I would
suggest waiting for a reply from someone who has used the instrument
this century and not that last....

cheers
Brad

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