||Aborts an ongoing exposure (see also expose).
||[-c] [-q] [-nofo] <slit> <tt>
Script for ALFOSC-spectroscopy target acquisition. Supported modes:
- single-star long-slit
Will first do a binned full-frame image and then another iteration on a 800x800 windowed image.
The binned image is taken with 1/4 of the requested exposure time.
The acquisition images are analysed interactively using slitoff, which will move the telescope and guide probe to get the star on the requested slit.
- -c make a check image of the star and the slit.
- -q query the user for another iteration.
-nofo do not execute alfosc.focus-offset
- <slit-specifier> unambiguous string to specify slit.
- <exptime> exposure time for target acquisition images.
The user may request a check of the positioning by making an additional test image with the slit in the beam. In this case the slit will be left in the beam at exit of the script. The user may request an interactive query, which allows to do additional slitoff iterations,
and in case a slit image is requested to
do aditional slit images.
If a polarimetry slitlet is specified, the script will setup for spectropolarimetry. This script makes sure that the aperture and grism wheels are correctly positioned, and does not move any of the filter wheels for in case a (blocking-)filter has to be in the beam (which should be put in the beam before starting alfosc.acquisition). Exception: if a filter-wheel (cross-disperser) grism is in the beam, the filter wheel will be put to OPEN. Moves the calibration mirror out of the beam. Moves the FAPOL carriage in/out when necesary. Moves to the default internal focus for normal and specpol setups.
Executes alfosc.focus-offset before the first acquisition image is taken, unless command-line flag -nofo is given.
Exits with full-frame unbinned CCD settings, and autosave_on. Note: the slit specifier should be a unique string. A list of optical elements can be found here.
alfosc.acquisition -c -q Slit_1.0 2   Makes acquisition with 2s exposure time, using horizontal 1.0" slit, shows check-image of the star and the slit and queries user for another iteration.
||Will move all ALFOSC/FASU optical wheels to the OPEN position. Only wheels that according to the ALFOSC status are not already OPEN will be commanded to move. FASU wheels will always be commanded to move.
||Turns off the automatic image display while reading out. If DS9 is running it will be terminated.
||Turns on the automatic image display while reading out. If no DS9 is running one will automatically be started.
||[-e] [-f] [-n <nn>] [-o <ObjName>] [-lmi] <lampID> <tt>
||Script for making a calibration spectrum with ALFOSC. Possible arguments are:
Sets the ALFOSC calibration items (mirror & lamps) up for a calibration spectrum, takes the calibration image(s) of which the last one in the background, switches off lamps, and per default takes calibration mirror out at exit. Switches autosave_on, and leaves it on. Moves FAPOL out if necesary. Sets header IMTYPE to FLAT/WAVE . If an <ObjectName> is given (double quoted if containing spaces), then the string will be added to the already present lamp specifier in the OBJECT FITS keyword. If CNTR-C is pressed the ongoing exposure will be aborted, and the calibration mirror will be moved out of the beam. NOTE: the last exposure will be taken in the background, so that instrument setup can be done during readout.
- -e echo mode: do not execute commands, only echo them
- -f fast mode:
script will return during the readout of the last exposure
- -n <Nexp> optional number of exposures (default=1)
- -o <ObjectName> optional ObjectName
- -lmi if set the mirror will stay in the beam at exit
- <lampID> with <lampID>=He/Ne/HeNe/ThAr/Halogen
- <exptime> exposure time
alfosc.calibexp -n 2 Halogen 15   Makes 2 halogen flatfield images with individual exposure time of 15s.
||[-d] [-t] [-f] [-n]<tt>
||Makes a dark exposure of <tt> seconds. If <tt> is set to zero a BIAS exposure is made.
If the exposure time is larger then 60 seconds, automatic remnant removal is done before the exposure starts.
If the option [-f] (fast mode) is used, the prompt will be returned when the exposure time is over and before the readout begins.
If the option [-n] is used, there will be no automatic remnant removal.
||Loads an image into the ALFOSC DS9 display. If no <file> is specified, the last image obtained will be loaded. If no DS9 display exists, one will be started.
|| [-d] [-t] [-f] [-n]<tt>
||Makes an exposure of <tt> seconds.
Remnant removal is made before the exposure starts, if the exposure time is larger then 60 seconds. If the option [-n] is used, no remnant removal is done.
To abort the exposure press "Control-C". This command checks if ALFOSC, FASU and FAPOL are ready before beginning the exposure. If 90 seconds occurs and it is not ready this command will time out.
If the option [-f] (fast mode) is used, the prompt will be returned when the exposure time is over and before the readout begins. If [-f] is used, make sure that "alfosc.wait-camera-state idle"-command is given before any "alfosc_camera_commands".
If the exposure time is larger than 300 seconds, the time left until the rotator reaches its limit will be checked. If there is not time enough to complete the exposure, an error will be generated and the exposure will not start.
||[-e] [-n <N>] [-nodefault] [-t <nn>] [-a <mode>][-filter]
||Fully automated focus script for ALFOSC.
[-n <N>]: Number, <N>, of maximal loops, default is 3.
[-t <nn>] Expose <nn> seconds. Default is 10.
[-nodefault]: Start from actual focus rather than default focus.
[-filter]: Leave current filters in the beam
[-a <mode>]: Acquisition mode. <mode> can be:
Focus is determined without any filter in the beam (except if the -filter flag is set). Filter and any other ALFOSC instrument & detector settings will be saved before running the focus script and restored at the end.
- noacq: Use current pointing for focusing.
- nearest: Use nearest focus field from current pointing.
- optimal: Use nearest focus field between 60-70 degrees altitude (default)
The 'focus' command is the recommended way of focusing the telescope. In case the command fails, for instance if too few stars are detected in the image, the focus can be determined in a more interactive mode by using the commands focuspyr-setup, expose, focuspyr, focus-position (see documentation on these commands for further information).
alfosc.focus -n 4 -t 15 -a nearest Focuses the telescope using the nearest focusfield, doing 4 loops with individual exposures of 15s.
||[-e] [-d <nn>]
||Optics in the beam introduces a telescope focus offset (see table). The 'focus-offset' command checks what is currently in the FASU and ALFOSC filter wheels and applies the corresponding focus offset (using foc-del) when possible. The focus offset introduced by a retarder plate in polarimetry mode is also accounted for. Be very careful when using this command. Focus offset for many optical elements are not known and as a consequence the telescope may in fact not be in focus even after using this command. If the focus offset is not known, 0 will be assumed. If this occurs, a warning message will appear both in the talker window and in the sequencer window. Several warning messages may appear if several optical elements in the beam have unknown focus offsets. The final telescope focus offset applied is the sum of the offsets for the element in each wheel, and may therefore be wrong if any offset is unknown. Do not use this command in scripts unless you are absolutely sure that the focus offset are known for all optical elements to be used.
If you intentionally wish to defocus the telescope (for instance when observing very bright targets), call the script with the [-d] flag, specifying the number of focus units to defocus the telescope with, for instance
focus-offset -d 200
will defocus the telescope with 200 units with respect to optimal focus. Reasonable defocus values ranges from 50-2000 units.
||Initiates an IRAF imexam session on the image currently loaded into the ALFOSC DS9. While active in the imexam session, no further commands can be issued from the sequencer window. To kill the imexam session type q on the image in the postprocessing display.
CURSOR KEY COMMANDS:
? Print help
a Aperture radial photometry measurement (see above for output)
c Column plot
e Contour plot
f Redraw the last graph
j Fit 1D gaussian to image lines
k Fit 1D gaussian to image columns
l Line plot
image[section] npixels mean median stddev min max
r Radial profile plot (see above for output)
s Surface plot
x Print coordinates
col line pixval [xorign yorigin dx dy r theta]
||[-d] [position] <n> <m>
||Turn on/off lamp no. <n>, where <n> is [1-4] and <m>='1' to turn on and <m>='0' to turn off. Current (29/10-2007) lamp setup: Lamp 1 is "He" Lamp 2 is "Ne" Lamp 3 is "Halogen" Lamp 4 is "ThAr Hollow Cathode". A timer will turn off any lamp after 1200 sec. Subsequent commands to turn on a lamp will result in the timer being reset to 1200 seconds. [position] returns a 4 bit pattern corresponding to the state of the 4 lamps: If bit no. 1 is set, lamp no. 1 is on, else off If bit no. 2 is set, lamp no. 2 is on, else off If bit no. 3 is set, lamp no. 3 is on, else off If bit no. 4 is set, lamp no. 4 is on, else off
||"Comment in quotes" [file1 file2 ...]
||When invoked with just the comment, it will be applied to the latest available image with a prefix for the current night (which starts at noon) and the sequencer's instrument.
If image names are provided, the program will test the existence of ALL them before applying the change.
$ alfosc.log-comment "This is a comment"
$ alfosc.log-comment "Comment for two" ALug170154 ALug170155
Notice that there's no need to add the ".fits" after each image's name
If no arguments are provided, a usage message is displayed
||[-t] [-n] [-f]<tt> <nn>
||Makes <nn> dark exposure of <tt> seconds. To abort the exposures press "Control-C". The image type (IMTYPE keyword) will be set to "DARK" if the exposure time is non-zero and "BIAS" if it is zero. If the exposure time is larger then 60 seconds, automatic remnant removal is done before the exposure starts. If the option [-f] (fast mode) is used, the prompt will be returned when the exposure time is over and before the readout begins. If the option [-n] is used, there will be no automatic remnant removal.
||[-t] [-n] [-f]<tt> <nn> [<imtype>]
||Makes <nn> exposures of <tt> seconds. To abort the exposures press "Control-C". The <imtype> option (IMTYPE keyword) is optional and must be a text string without spaces. There are reported problems with this command that have not yet been solved. If you experience this, please use the alternative command single-mexpose.Remnant removal is made before the exposure starts, if the exposure time is larger then 60 seconds. If the option [-n] is used, no remnant removal is done. If the option [-f] (fast mode) is used, the prompt will be returned when the exposure time is over and before the readout begins. If [-f] is used, make sure that "alfosc.wait-camera-state idle"-command is given before any "alfosc_camera_commands". If the exposure time is larger than 300 seconds, the time left until the rotator reaches its limit will be checked. If there is not time enough to complete the exposure, an error will be generated and the exposure will not start.
||Sets the FITS keyword OBJECT to <text>.
||Extracts spectra and applies an approximate wavelength calibration on an ALFOSC spectroscopic image using the iraf tasks apall and dispcor. If no file is specified, spectral extraction from the last image written to disk will be attempted. Extracted spectra are kept in the directory /data/reduced/alfosc/ on the instrument computer. Existing spectra will be overwritten if the task is re-run on the same file. The wavelength calibration is done using standard wavelength settings for the standard horizontally oriented central slits. The wavelength calibration is only approximate, and is most likely based on a slit that you are not currently using. Note that the slits have different Y-positions and hence different wavelength zeropoints, and that hence zeropoint offsets of for instance 200 Ångström are normal. The quickspec will leave the user in an IRAF splot session. To kill the session type q in the postprocessing graphics window. There are 2 ways of initiating quickspec. Automatic (see command quickspec-config auto=yes below), and from the sequencer command line. * When called from the sequencer command line, all input and output will go through that sequencer terminal. * When automatic, the input and output goes through the BIAS 'command' window.
||Use this command to set the IRAF apall task parameters used in the quickspec script.
auto=[yes|no] : Automatically run quickspec on incoming images
kill=[yes|no] : Automatically remove previous quickspec windows
default : loads default values.
Below parameters are specific for the apal iraf task:
nfind=[1-10] (useful for Echelle spectra, MOS spectra, spectropolarimetry, and longslit spectra with more than one object on the slit)
If the command is issued without any options, current parameter settings will be listed.
||Closes the shutter and reads out the ccd. You have to put the exposure in the background first. This is achieved by pressing Ctrl+Z in the sequencer where the expose command is running, followed by running the command bg. Note that this command does not work correctly when using a window in Y direction: data from a wrong window will be saved to file.
||Sets the CCD readout speed to <readout_speed> kpix/second. Valid values for <readout_speed> are 100, 200, 400 or 800.
||Remove remnants from the CCD when saturation has taken place.
||Sets the remote saving path to <nn>.
||Turns off remote saving.
||Turns on remote saving.
||The script will use infosys.kill to reset the monitoring system, then it will wait for a set number of seconds, and at last it will instruct the obslog to show the listing for alfosc, all the while informing the user about what is happening
If there's any error, the script will notify the user and suggest further actions.
||Resets the ccd binning to 1, the X and Y size to maximum and the X and Y beginning to 1.
||[slit=<nn> | xref=<x> yref=<y>]
||Calculates the telescope offset required to bring a target onto a given slit and performs the required telescope offset. The slit number <slitno> refers to the position of the requested slit in the ALFOSC slit wheel. Alternatively, an (<x>,<y>) pixel position can be given as reference. The script uses the currently loaded DS9 image and assumes this corresponds to an acquisition image of the field the telescope currently is pointed at. The target is identified interactively by the user through an imexam session.
||Uses the currently loaded DS9 image to compute the TCS field rotation angle required to align two objects along a slit. The targets are identified interactively by the user through an imexam session.
||[-e] [-s <slit>] [-g <grism>] [-c <crossdisp>] [-f <filterID>] [-d <diffuserID>][-nowait] [-forceFASU]
||Script to setup all 5 ALFOSC wheels, in quickest possible way. Possible arguments are:
Each wheel defaults to the OPEN position, unless it needs to be put to a different position as requested through the command-line arguments. Consequently, without any arguments alfosc.wheels puts all wheels to open. The script uses alfosc.optics to check the feasibility of the requested setup. If feasible, the wheels will be moved to put the requested items in the beam. If wheels are already in the correct position they will not be exercised, except for the FASU wheels when flag -forceFASU is given. If a requested setup is not possible, an error will result, and no wheels will be moved. Note: grism/slit strings should be unique. A list of optical items can be found here. Note: filter ID numbers can be found here. Note: the Focus_Pyr is considered a grism!! Note: for spectroscopy the horizontal/vertical requirements for the optical elements are tested.
- -s <slit> aperture-wheel item string
- -g <grism> grism string
- -c <crossdisperser> crossdisp grism string
- -f <filterID> filter ID number
- -d <diffuserID> diffuser ID number
- -nowait exit while wheels are moving
- -forceFASU force the FASU wheels to move even when at required position
- alfosc.wheels -f 74 sets up for imaging with filter #74
- alfosc.wheels -g Focus_Pyr sets up for focusing without filters
- alfosc.wheels -s Slit_1.0 -g "#4" sets up for spectroscopy with slit 1.0" and Gr#4
- alfosc.wheels -s Slit_1.0 -g "#4" -f 93 sets up for spectroscopy with slit 1.0" and Gr#4 and blocking filter #93
- alfosc.wheels -s Ech_0.8 -g "#9" -c "#10" sets up for Echelle spectroscopy with slit 0.8" and Echelle Gr#9 and cross disperser Gr#10
||Sets the X beginning to <nn>.
||Sets the binning factor in the X direction to <n>.
||Sets the X size to <nn>.
||Sets the Y beginning to <nn>.
||Sets the binning factor in the Y direction to <n>.
||Sets the Y size to <nn>.