Execute the script too-alfosc-spectroscopy.sh and too-alfosc-spec-flat.sh, if requested
a) ./too-alfosc-spectroscopy.sh
Description:
First preset the telescope to the TCSTGT (TCS Catalogue Entry; OBJECT).
The user is requested to check guiding and press return to continue if OK. Then the target is
positioned interactively on the slit using the alfosc.acquisition sequencer
script. This procedure is described in detail here.
The user is requested to check the target position and press return to continue if OK. Then
NUM_EXP exposures with exposure time EXP_TIME
using grism GRISM (read
here for the difference between horizontal and vertical spectrum orientation), slit
SLIT and an optional blocking filter FILTER
followed by one wavelength calibration exposure are taken. Flat exposures are also taken depending on
the value of FLAT. Optionally, a dither pattern
DITH_PAT with dither step DITH_STEP, CCD window spatial size
WSIZE, CCD amplifier AMPLIFIER and
wavelength calibration lamp LAMP may be set.
The script exits with full CCD window, high gain, amplifier A , field rotation 90 and
guiding off.
Format:
./too-alfosc-spectroscopy.sh OBJECT GRISM SLIT ACQ_TIME EXP_TIME NUM_EXP [filter=FILTER dither=DITHER flat=FLAT wsize=WSIZE ampl=AMPLIFIER lamp=LAMP adc=ADC]
OBJECT: Object name (as defined in the TCS catalogue)
GRISM: Grism_#4 | Grism_#7 | Grism_#16 (see also here)
SLIT: Slit_0.75 | Slit_1.0 | Slit_1.3 (see also here; the arcsec symbol must not to be written)
ACQ_TIME: Exposure time (in seconds) for slit positioning images
EXP_TIME: Exposure time (in seconds)
NUM_EXP: Number of exposures
FILTER: FILT_ID[:FILT_FOC] | no (default) | FILT_ALIAS
FILT_ID: Blocking filter ID are defined at here
FILT_FOC: Filter focus offset
FILT_ALIAS: WG345 (94) | GG420 (100) | GG475 (101) | OG515 (102) | OG575 (103)
DITHER: DITH_PAT:DITH_STEP | no (default)
DITH_PAT: Dither pattern (2-point | 3-point | abba)
DITH_STEP: Dither step (in arc seconds)
FLAT: take flatfield exposures (before (default) | before-each | before-after-each | no)
WSIZE: CCD window spatial size (in pixels) (default: 400) | full
AMPLIFIER: CCD amplifier (A | B | AB | C)
LAMP: Wave calibration lamp ID (He | Ne | HeNe (default) | ThAr)
ADC: Atmospheric dispersion corrector (In (default) | Out)
Example:
./too-alfosc-spectroscopy.sh GRB130703A Grism_#4 Slit_1.0 60 1800 3 dither=3-point:5 filter=WG345
will first take a slit positioning image (exposure time 60 s). Then the 3 exposures will
be taken with an individual exposure time of 1800 s using Grism_#4 and Slit_1.0. The
blocking filter WG345 (94) is used to suppress 2nd order contamination in the red part
of the spectrum. These only affect observations with grism_#4. For that grism fringing begins at 6700
Å (7% at 7500 Å, 20-25% <8000 Å). To improve the background subtraction
in the red part of the spectrum a 3-step dither pattern is used (step size: 5'').
A HeNe arc spectrum will be taken as well. The atmospheric disperson corrector (ADC) is
by default in the beam. This leads to a 10% reduced sensitivity from U to I band.
By default, CCD amplifier A and a CCD window of 400 pixels in the spatial
direction are used.
b) ./too-alfosc-spec-flat.sh
Description:
NUM_EXP flat exposures with exposure time EXP_TIME
using grism GRISM, slit SLIT and an optional blocking
filter FILTER are taken. Optionally, the CCD window spatial size
WSIZE, CCD amplifier AMPLIFIER may be set.
The script exits with full CCD window, high gain, amplifier A and all wheels in open position.
Format:
./too-alfosc-spec-flat.sh GRISM SLIT NUM_EXP [filter=FILTER wsize=WSIZE ampl=AMPLIFIER lamp=LAMP adc=ADC]
GRISM: Grism_#4 | Grism_#7 | Grism_#16 (see also here)
SLIT: Slit_0.75 | Slit_1.0 | Slit_1.3 (see also here; the arcsec symbol must not to be written)
NUM_EXP: Number of exposures
FILTER: FILT_ID[:FILT_FOC] | no (default) | FILT_ALIAS
FILT_ID: Blocking filter ID are defined at here
FILT_FOC: Filter focus offset
FILT_ALIAS: WG345 (94) | GG420 (100) | GG475 (101) | OG515 (102) | OG575 (103)
WSIZE: CCD window spatial size (in pixels) (default: 400) | full
AMPLIFIER: CCD amplifier (A (default) | B | AB | C)
ADC: Atmospheric dispersion corrector (In (default) | Out)
Example:
./too-alfosc-spec-flat.sh Grism_#4 Slit_1.0 3
Will take 3 flat exposures using Grism_#4 and Slit_1.0. CCD amplifier A and a CCD window
of 400 pixels in the spatial direction will be used. The atmospheric disperson corrector (ADC) is
by default in the beam. This leads to a 10% reduced sensitivity from U to I band.
