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UFTI Template Observations
Template Observations available for use with UFTI
Below we list the template observations that are
currently available in the UKIRT OT Template Library. A brief
description of what each sequence does is included.
A complete list of ORAC-DR
Recipes for use with UFTI is also available. A detailed description
of each recipe can be obtained by clicking on the recipe name.
Compact/Point-Source Sequences
| Sequence Name |
Appropriate DRRecipes |
Description |
| 9pt Jitter |
JITTER_SELF_FLAT
JITTER_SELF_FLAT_NO_MASK
JITTER_SELF_FLAT_BASIC |
3x3 jitter maps, with either 10 or 20 arcsec grid (a 85 arcsec grid sequence is also provided for mapping large regions with a sparse
stellar/point-source population - see below for mapping extended/diffuse sources). The nine frames are median averaged
to provide the flat-field. Good for point or compact sources, although I and Z will need
separate flats. Requires only a dark. |
| 5pt Jitter |
JITTER_SELF_FLAT
JITTER_SELF_FLAT_NO_MASK
JITTER_SELF_FLAT_BASIC |
5-point jitter maps, with either 10 or 20 arcsec grids. Flat-field
made from median average of
the 5 frames. Good for point or compact sources, although I and Z will need
separate flats. Requires an appropriate dark. |
| 5pt Jitter (Bright Point Source) |
BRIGHT_POINT_SOURCE
BRIGHT_POINT_SOURCE_APHOT |
5-point jitter maps, using a separate flat-field
made earlier. Good for bright point/compact sources that require short integration times.
Also requires an appropriate dark. |
| JHK Photometry |
JITTER_SELF_FLAT_NCOLOUR |
Multi-colour photometry, via repeated 5-point jitter patterns.
Requires only a dark. |
| Multi-colour imaging (9 pt jitter) |
JITTER_SELF_FLAT_NCOLOUR |
3x3 jitter maps made in three different colours. There separate flats are made from the jitter maps, one in each colour. Two options are available, one more efficient, the other more likely gives equal integration times per filter.
Requires only a dark. |
| Quadrant Jitter |
QUADRANT_JITTER
QUADRANT_JITTER_NOMASK
QUADRANT_JITTER_BASIC |
Sources moved between 4 quadrants of the array; flat-field created from the four frames.
Suitable for faint objects or objects within a comparatively bright core embedded in
faint extended emission. Requires an appropriate dark. |
| Sky and Jitter5 |
SKY_AND_JITTER
SKY_AND_JITTER_APHOT |
Sky followed by a 5-point jitter. The sky is
subtracted and a pre-determined flat is used. (Primarily for use
with IRCAM). Requires an appropriate dark. |
Extended-Source Sequences
| Sequence Name |
Appropriate DRRecipes |
Description |
| Extended_3x3 |
EXTENDED_3x3
EXTENDED_3x3_BASIC |
Object and blank sky frames interspersed; object frames are dithered (3x3) on-source.
Starts and ends on sky (thus 19 frames
in total). A flat is constructed from the sky frames. Also requires a dark. |
| Extended_5x5 |
EXTENDED_5x5
EXTENDED_5x5_BASIC |
Object and blank sky frames interspersed; object frames are dithered (5x5) on-source.
Starts and ends on sky (thus 51 frames
in total). A flat is constructed from the sky frames. Also requires a dark. |
| Chop Obj-Sky with 9pt Jitter |
CHOP_SKY_JITTER
CHOP_SKY_JITTER_BASIC |
Object and blank sky frames interspersed, starting and ending on sky (thus 19 frames
in total). Uses smaller jitter-offsets about the source than Extended_3x3; appropriate for
a target that fills less than about 90% of the array. A flat is constructed from the sky frames.
Also requires a dark. |
Fabry-Perot Sequences
| Sequence Name |
Appropriate DRRecipes |
Description |
| FPX Alignment |
QUICK_LOOK |
Alignment of Tip (FPX) of FP plates. To be
carried out in daytime before start of observing run. |
| FPY Alignment |
QUICK_LOOK |
Alignment of Tilt (FPY) of FP plates. To be
carried out in daytime before start of observing run. |
| FPZ Alignment |
QUICK_LOOK |
Alignment of FPZ (plate separation).
Iterates through the FPZ steps to "tune" to an arc lamp emission line. |
| Make_Skyflat for FP |
SKY_FLAT_FP |
To create a sky flat (from jittered blank-sky exposures) with the FP at on- and off-line wavelengths.
Requires a dark. |
| Basic (FP) |
FP |
To obtain a sequence of 8 frames; object-sky pairs at on-line, off-line (blue), on-line
and off-line (red) FP settings. Requires a separate flat-field (use "Make_Skyflat for FP")
and a dark. |
| Jitter 5 (FP) |
FP_JITTER |
The Basic FP sequence described above, though repeated 5 times at slightly-jittered
positions. Requires a separate flat-field (use "Make_Skyflat for FP") and a dark. |
| Jitter 5 no sky (FP) |
FP_JITTER_NO_SKY |
Obtains only object frames at on-line, off-line (blue), on-line
and off-line (red) FP settings, i.e. assumes negligeable sky background. Jitters on-source.
Requires a separate flat-field (use "Make_Skyflat for FP") and a dark. |
| Flux standard for FP |
BRIGHT_POINT_SOURCE |
Obtains 5-point jitter at each of three FP settings (on-line, off-line-blue, off-line-red).
Requires a separate flat-field (use "Make_Skyflat for FP") and a dark. |
Polarimetry Sequences
| Sequence Name |
Appropriate DRRecipes |
Description |
| Make_Skyflat for Pol (UFTI) |
SKY_FLAT_POL |
Obtain a "master" flat-field from the median average of 8 jittered frames; the waveplate is cycled
after every second frame.
|
| Make_Skyflat for each WP angle for Pol (UFTI) |
SKY_FLAT_POL_ANGLE |
Obtain 4 flat-fields, 1 for each WP angle, from the median average of jittered frames.
|
| Pol Jitter then Angle |
POL_JITTER |
Obtain 3 jittered frames at each of the 4 waveplate positions;
the telescope is moved before the waveplate. An appropriate
dark and separate flat-field must be obtained (use either "Make_Skyflat..." sequence listed
above). |
| Pol Angle then Jitter |
POL_ANGLE_JITTER |
Observe at the 4 waveplate angles at each of 3 jittered positions; the waveplate
is moved before the telescope. An appropriate
dark and separate flat-field must be obtained (use either "Make_Skyflat..." sequence listed
above). |
| Pol Extended |
POL_EXTENDED |
Nod between object and blank sky; object-sky pairs obtained at
each of the 4 waveplate angles.An appropriate
dark and separate flat-field must be obtained (use either "Make_Skyflat..." sequence listed
above). |
Miscellaneous Sequences
| Sequence Name |
Appropriate DRRecipes |
Description |
| Array_Tests |
ARRAY_TESTS |
Dark exposures from which read noise is calculated; use at the beginning of the night.
|
| Make_Skyflats |
SKY_FLAT
SKY_FLAT_MASKED |
Construct a flat field from a sequence of jittered object or sky frames. I and Z-band variants have longer integration times (and could be used
with fewer averaged frames). |
| Flush Array |
QUICK_LOOK |
Takes 3 short darks to clear array of latency features. |
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