Classified Recipes

In hindsight you may decide that there was a better recipe for your data than stored in the RECIPE header. Also you may have used a faster variant of a recipe at the telescope, but now want the full reduction. Here is a classified list so that you can select an alternative. Magnitudes and dimensions apply to UFTI, except for the NOD_SELF_FLAT_NO_MASK recipes, whose magnitude ranges are for IRCAM; and the $\raisebox{-0.4ex}{\rm *}$NOD_CHOP $\raisebox{-0.4ex}{\rm *}$ recipes which are applicable to Michelle. For IRCAM, dimensions are 10% smaller; for IRIS2 dimensions are 6.8 x larger; for UIST they are either 33% smaller or 22% larger depending on the camera. The magnitude ranges are courtesy of Sandy Leggett and apply to UKIRT.

Calibration Recipes
Recipe Name	Type of Data	Function and Comments
ARRAY_TESTS	Array check	Calculates read noise and dark current.
DARK_AND_BPM	Dark and Mask	Measures dark current and creates a new bad-pixel mask for UIST.
DIFFERENCE_STATS	Array Check and Mask	Calculates statisticd for Michelle darks in a pairwise manner.
LAMP_FLAT	Mask	Creates and files imaging flat fields derived from a calibration lamp for ESO instruments.
MAKE_BPM	Mask	Creates a bad-pixel mask by standard-deviation thresholding.
MEASURE_READNOISE	Array check	Measures and files the readnoise for UIST from a set of dark frames.
REDUCE_DARK	Dark	Averages and files observations as the current dark.
REDUCE_FLAT	Flat	Reduces an imaging flat field.
SKY_FLAT	Flat	Creates and files a flat field derived from five jittered frames. Mostly for use with BRIGHT_POINT_SOURCE recipes. Requires a dark.
SKY_FLAT_FP	Flat	Creates a Fabry-Perot sky flat (from jittered blank-sky exposures) FP at on- and off-line wavelengths. Requires a dark.
SKY_FLAT_MASKED	Flat	As SKY_FLAT but masks objects to give a better flat field.
SKY_FLAT_POL	Flat	Obtain a `master' polarimetry flat field from the median average of eight jittered frames; the waveplate is cycled after every second frame. Makes a copy of the flat for each waveplate angle. Requires a dark.
SKY_FLAT_POL_ANGLE	Flat	Obtain four polarimetry flat fields, one for each waveplate angle, from the median average of jittered frames. Requires a dark.

Miscellaneous recipes
Recipe Name	Type of Data	Function and Comments
ADDWCS		Creates the valid WCS in the FITS headers of raw data.
NIGHT_LOG		Generates a text-file log of a series of observations.

Very-bright-point-source recipes
Recipe Name	Type of Data	Function and Comments
BRIGHT_POINT_SOURCE	IZ<13, JHK<9, and bright 13<IZ<17, 9<JHK<15	Normally a 5-point jitter but would be usable as 3-point. Requires a separate flat as the background is too low to self flat, and a dark.
BRIGHT_POINT_SOURCE_APHOT		As BRIGHT_POINT_SOURCE, but also performs aperture photometry of the source.
BRIGHT_POINT_SOURCE_NCOLOUR		As BRIGHT_POINT_SOURCE, but produces filenames that include filters for easier identification for multi-colour observations.
BRIGHT_POINT_SOURCE_NCOLOUR_APHOT		As BRIGHT_POINT_SOURCE_APHOT, but produces filenames that include filters for easier identification for multi-colour observations.
BRIGHT_POINT_SOURCE_TELE		As BRIGHT_POINT_SOURCE, but uses telescope offsets for registration.
BRIGHT_POINT_SOURCE_TELE_APHOT		As BRIGHT_POINT_SOURCE_APHOT, but uses telescope offsets for registration.

Point-source recipes--thermal
Recipe Name	Type of Data	Function and Comments
NOD_SELF_FLAT_NO_MASK	Bright L<10; or all M, faint L>10	Nod jitter, self flats of differenced pairs of frames. Has superior and fast sky subtraction. No object masking. Requires a dark. Use 4-point jitter for L<10, and 8-point for fainter L and all M.
NOD_SELF_FLAT_NO_MASK_APHOT		As the previous recipe, but also performs aperture photometry of the positive and negative sources.
NOD_SKY_FLAT_THERMAL		Nod jitter, interspersed sky frames. Sky subtraction, flat field created from sky frames only. Requires a dark. 4-point jitter (8-point sequence).

Bright-point-source recipes
Recipe Name	Type of Data	Function and Comments
JITTER_SELF_FLAT	13<I,Z<17, 9<JHK<15	Standard jitter, self flats. Normally 5-point jitter. Requires a dark.
JITTER_SELF_FLAT_APHOT		As JITTER_SELF_FLAT, but also performs aperture photometry of the source.
JITTER_SELF_FLAT_NO_MASK		As JITTER_SELF_FLAT but faster as it lacks object masking. It only suitable for uncrowded fields.
JITTER_SELF_FLAT_NCOLOUR_APHOT		As JITTER_SELF_FLAT_APHOT, but produces filenames that include filters for easier identification for multi-colour observation sequences.
SKY_AND_JITTER		A sky frame and jitter on target. The sky is subtracted from the target frame before flat fielding. Requires a separate flat, as the background is too low to self flat, and a dark. No longer recommended as sky varies too quickly.
SKY_AND_JITTER_APHOT		As SKY_AND_JITTER, but also performs aperture photometry of the source.

Faint-point-source recipes
Recipe Name	Type of Data	Function and Comments
JITTER_SELF_FLAT	Faint I,Z>17, JHK>15	Standard jitter, self flats. Normally 9-point jitter. Requires a dark.
JITTER_SELF_FLAT_CATALOGUE		As JITTER_SELF_FLAT but produces an inventory of the locations and brightnesses of sources within the mosaic.
BRIGHT_POINT_SOURCE_CATALOGUE		As BRIGHT_POINT_SOURCE but produces an inventory of the locations and brightnesses of sources within the mosaic. Preferred when a self-flat is not appropriate.
JITTER_SELF_FLAT_BASIC		Fastest JITTER_SELF_FLAT recipe as it lacks object masking, automatic registration and resampling.
JITTER_SELF_FLAT_NO_MASK		As JITTER_SELF_FLAT, but faster as it lacks object masking. It only suitable for uncrowded fields.

Extended-source recipes
Recipe Name	Type of Data	Function and Comments
QUADRANT_JITTER	Galaxies, quasars and nebulae of small (<45 arcsec) angular extent	4-point jitter; masks the quadrant containing the target to make the flat, then masks the objects. Requires a dark.
QUADRANT_JITTER_NO_MASK		As QUADRANT_JITTER but without object masking.
QUADRANT_JITTER_BASIC		Fastest QUADRANT_JITTER variant as it lacks object masking, automatic registration and resampling.
MOVING_QUADRANT_JITTER	Compact comets (<45 arcsec)	As QUADRANT_JITTER, but uses ephemeris data to track the non-sidereal source.
QUADRANT_JITTER_TELE		As QUADRANT_JITTER but uses telescope offsets for registration. Telescope tracks object.
EXTENDED_3x3	Galaxies and nebulae with angular extent <2 arcminutes	Sky-subtracted 3 x 3 grid mosaic on target. Frames alternate between sky and target. Requires a dark.
EXTENDED_3x3_BASIC		As EXTENDED_3x3 but lacks resampling and registers using telescope offsets.
EXTENDED_5x5	Galaxies and nebulae with angular extent <3 arcminutes	Sky-subtracted 5 x 5 grid mosaic of the target. Frames alternate between sky and target. Requires a dark.
EXTENDED_5x5_BASIC		As EXTENDED_5x5 but lacks resampling and registers using telescope offsets.

Point-source recipes--mid-infra-red
Recipe Name	Type of Data	Function and Comments
NOD_CHOP	Bright N and Q (limits to be determined)	Chopped and nodded observations to remove sky background and telescope contributions; differences both chopped beams and nodded pairs of frames giving a mosaic with two positive and two negative images. There is no masking or flat-fielding. Requires a bias in CHOP mode, e.g. from recipe ARRAY_TESTS.
NOD_CHOP_APHOT		As the previous recipe, but also performs aperture photometry of the combined four images (after extraction and centroid registration).
NOD_CHOP_FAINT		As NOD_CHOP, but removes column and row artifacts from the mosaic, then it combines each chopped and nodded image using a median filter to form an image of the source with four times the signal. This image is then smoothed to enhance the visibility of faint sources.
NOD_CHOP_SCAN		As NOD_CHOP, but for chopped and nodded observations that are taken in a scan pattern. A mosaic is formed at each scan position.

Moving (non-sidereal) source recipes
Recipe Name	Type of Data	Function and Comments
MOVING_JITTER_SELF_FLAT	Minor planets, comets	As JITTER_SELF_FLAT, but uses ephemeris data to track the non-sidereal source.
MOVING_JITTER_SELF_FLAT_BASIC		As JITTER_SELF_FLAT_BASIC, but uses ephemeris data to track the non-sidereal source.
JITTER_SELF_FLAT_TELE		Standard jitter, using telescope offsets. This is needed when the telescope has tracked on the non-sidereal target. Requires a dark.
MOVING_NOD_CHOP		As NOD_CHOP, but uses ephemeris data to track the non-sidereal source in the mid-infra-red.
MOVING_QUADRANT_JITTER	Compact comets	As QUADRANT_JITTER, but uses ephemeris data to track the non-sidereal source.
QUADRANT_JITTER_TELE		As QUADRANT_JITTER but uses telescope offsets for registration. This is needed when the telescope has tracked on the non-sidereal target.

Polarimetry recipes
Recipe Name	Type of Data	Function and Comments
POL_ANGLE_JITTER	Polarimetry of point or small ($<\sim35$ arcsec) extended sources	Makes a polarisation map from frames at the four waveplate angles at each of at least three jittered positions; the waveplate is moved before the telescope. An appropriate dark and separate flat fields at each waveplate angle (using SKY_FLAT_POL or SKY_FLAT_POL_ANGLE) must be obtained.
POL_ANGLE_NOD_CHOP	Polarimetry of point or small ($<\sim10$ arcsec) extended sources in mid-infra-red	Makes a polarisation map from chopped and nodded frames at the four waveplate angles at two nod positions; the waveplate is moved before the telescope is nodded. There is no object masking or flat fielding. Requires a bias in CHOP mode, e.g. from recipe ARRAY_TESTS.
POL_EXTENDED	Polarimetry of extended sources	Makes a polarisation map of an extended source from frames nodded between object and blank sky. The object-sky pairs must be taken at each of the four waveplate angles. Requires an appropriate dark and separate flat fields at each waveplate angle.
POL_JITTER	Polarimetry of point or small ($<\sim35$ arcsec) extended sources	Makes a polarimetry map from frames at the four waveplate angles at each of at least three jittered positions; the telescope is moved before the waveplate. An appropriate dark and flat fields at each waveplate angle must be obtained.
POL_NOD_CHOP	Polarimetry of point or small ($<\sim10$ arcsec) extended sources in mid-infra-red	As POL_ANGLE_NOD_CHOP but the telescope is nodded before the waveplate is moved.
POL_QU_FIRST_NOD_CHOP	Polarimetry of point or small ($<\sim10$ arcsec) extended sources in mid-infra-red	It is a hybrid of POL_ANGLE_NOD_CHOP and POL_NOD_CHOP as the waveplate angle iterates in pairs at each jitter position.
SKY_FLAT_POL	Flat	Obtain a `master' polarimetry flat field from the median average of eight jittered frames; the waveplate is cycled after every second frame. Makes a copy of the flat for each waveplate angle. Requires a dark.

Fabry-Perot recipes
Recipe Name	Type of Data	Function and Comments
FP	Fabry-Perot	Uses a sequence of eight frames; object-sky pairs at on-line, off-line (blue), on-line and off-line (red) FP settings to make a mosaic. Requires a separate flat field (made by SKY_FLAT_FP) and a dark.
FP_JITTER		On/Off-line images with nodding to blank sky (as FP), and spatial jittering on-source. Requires a separate flat field and a dark.
FP_JITTER_NO_SKY		On/Off-line images without nodding to blank sky (i.e. sequence of four frames), and spatial jittering on-source. Requires a separate flat field and a dark.
SKY_FLAT_FP	Flat	Creates a Fabry-Perot sky flat (from jittered blank-sky exposures) FP at on- and off-line wavelengths. Requires a dark.