CIRSI Data Reduction Software(CIRDR)
Version 0.0.3 (Chan, McMahon and Hoenig)

CIRDR and IRAF

CIRDR is a data reduction package written under IRAF environment, for reducing data obtained with the Cambridge Infra Red Survey Instrument (CIRSI Camera).

The following is some useful background information about IRAF:

Introduction

There are three sub-packages within CIRDR: CQLOOK, CPLINE, CIRUTIL and additional sub-package CIRCONTRIB, which is based on software we have imported from elsewhere. .

* CQLOOK

CQLOOK is a package for 'quickly' producing rough sky subtracted images from sets of dithered observations during an observing run. Typical infrared observations are dominated by strong time and spatially variable background signal from the night sky. The dominance of the variable sky background in infrared data and the fact that usually the objects of interest are at flux levels where the fractional uncertainty in the sky background due to poisson counting errors and and interpixel flat fielding, requires dithering of many short exposures and the recombination of the images with careful sky subtraction to produce deep images. The primary high level tasks for reducing NDR and RRR data are CNDRPROC and CRRRPROC respectively. Most users should only need to use these tasks.
* CPLINE

CPLINE is a package for producing 2nd-pass/final-version sky subtracted images from sets of dithered observations.
* CIRUTIL

CIRUTIL is a general utility sub-package. For example, CIRUTIL contains tasks for displaying all 4 chips simultaneiously, displaying difference images and obtaining information from the FITs headers.
* CIRCONTRIB

CIRCONTRIB is a general contribution package which contains tasks contributed by other sites and users.

Getting Started