Subject: reducing GRIM imaging data

From: Vijay Narayanan

Submitted: Thu, 8 Mar 2001 11:56:22 -0500 (EST)

Message number: 46 (previous: 45, next: 47 up: Index)

Hi all,

   I'm reducing JHK imaging data taken with GRIM, in Feb '01.
   I'd appreciate advice from anyone who has reduced them in the 
   near past.

   I'm interested in the following:

   1)  I used the "obj4" script to do the sky/object/sky  chopping.
   Are the offsets quoted in the FITS header (as X and Y) accurate
   enough to be used for aligning the images?

   2) Does anyone have bad pixel masks and flats (in J,H and K)
   constructed recently?
   I've constructed these and I'd like to compare them with earlier
   ones to see if they are stable.

   3) I'm setting the Gain=4.7 electrons/ADU and readnoise=110
      electrons, as quoted in the GRIM manual (written in 1997).
      Has there been any recent measurements of these quantities?

   4) if you have scripts to shift/coadd the images obtained
      in the "obj4" pattern, that'd be much appreciated.

      Thanks,
      -- Vijay

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