Type of Data

Function and Comments

Array check

Calculates read noise and dark current.

Dark and Mask

Measures dark current and creates a new bad-pixel mask for UIST.

Array Check and Mask

Calculates statisticd for Michelle darks in a pairwise manner.

Mask

Creates and files imaging flat fields derived from a calibration lamp for ESO instruments.

Mask

Creates a bad-pixel mask by standard-deviation thresholding.

Array check

Measures and files the readnoise for UIST from a set of dark frames.

Dark

Averages and files observations as the current dark.

Flat

Reduces an imaging flat field.

Flat

Creates and files a flat field derived from five jittered frames. Mostly for use with BRIGHT_POINT_SOURCE recipes. Requires a dark.

Flat

Creates a Fabry-Perot sky flat (from jittered blank-sky exposures) FP at on- and off-line wavelengths. Requires a dark.

Flat

As SKY_FLAT but masks objects to give a better flat field.

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.

Flat

Obtain four polarimetry flat fields, one for each waveplate angle, from the median average of jittered frames. Requires a dark.

Recipe Name

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.

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.

Type of Data

Function and Comments

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 $M$.

As the previous recipe, but also performs aperture photometry of the positive and negative sources.

Nod jitter, interspersed sky frames. Sky subtraction, flat field created from sky frames only. Requires a dark. 4-point jitter (8-point sequence).

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.

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.

Type of Data

Function and Comments

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.

As QUADRANT_JITTER but without object masking.

Fastest QUADRANT_JITTER variant as it lacks object masking, automatic registration and resampling.

Compact comets ($<$45 arcsec)

As QUADRANT_JITTER, but uses ephemeris data to track the non-sidereal source.

As QUADRANT_JITTER but uses telescope offsets for registration. Telescope tracks object.

Galaxies and nebulae with angular extent $<$2 arcminutes

Sky-subtracted 3$\times$3 grid mosaic on target. Frames alternate between sky and target. Requires a dark.

As EXTENDED_3x3 but lacks resampling and registers using telescope offsets.

Galaxies and nebulae with angular extent $<$3 arcminutes

Sky-subtracted 5$\times$5 grid mosaic of the target. Frames alternate between sky and target. Requires a dark.

As EXTENDED_5x5 but lacks resampling and registers using telescope offsets.

Type of Data

Function and Comments

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.

As the previous recipe, but also performs aperture photometry of the combined four images (after extraction and centroid registration).

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.

As NOD_CHOP, but for chopped and nodded observations that are taken in a scan pattern. A mosaic is formed at each scan position.

Type of Data

Function and Comments

Minor planets, comets

As JITTER_SELF_FLAT, but uses ephemeris data to track the non-sidereal source.

As JITTER_SELF_FLAT_BASIC, but uses ephemeris data to track the non-sidereal source.

Standard jitter, using telescope offsets. This is needed when the telescope has tracked on the non-sidereal target. Requires a dark.

As NOD_CHOP, but uses ephemeris data to track the non-sidereal source in the mid-infra-red.

Compact comets

As QUADRANT_JITTER, but uses ephemeris data to track the non-sidereal source.

As QUADRANT_JITTER but uses telescope offsets for registration. This is needed when the telescope has tracked on the non-sidereal target.

Recipe Name

Type of Data

Function and Comments

POL_ANGLE_JITTER

Polarimetry of point or small ($<\sim 35$ 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 ($<\sim 10$ 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 ($<\sim 35$ 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 ($<\sim 10$ 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 ($<\sim 10$ 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.

Type of Data

Function and Comments

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.

On/Off-line images with nodding to blank sky (as FP), and spatial jittering on-source. Requires a separate flat field and a dark.

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.

Flat

Creates a Fabry-Perot sky flat (from jittered blank-sky exposures) FP at on- and off-line wavelengths. Requires a dark.