How to support & observe with LRIS
- Elena Manjavacas (Unlicensed)
Analytics
0/ Check if LRIS needs to be checkout for the month(https://www.keck.hawaii.edu/realpublic/inst/lris/monthly_checkout.html)
1/ Check SIAS to see if the configuration for the night has been installed.
2/ If it seems so, then run the command: "consort", to see what filters/gratings/masks are in the instrument
3/ Compare the configuration installed with what is supposed to be according to the observer (https://www2.keck.hawaii.edu/inst/siastng/release/web/ObsConf/welcomeScreenEh.php, use PI surname and your email). If something seems missing, call the summit.
4/ When LRIS is released, go ahead and start the session.
5/ Start all the GUIs from the background menu: LRIS control menu > Start All LRIS control
-----------------------------------VERY IMPORTANT----------------------------
3/ VERIFY THAT ALL YOUR FILTERS/GRATINGS SLITMASKS NEEDED FOR THE NIGHT ARE LOADED way before the day crew leaves the summit!!!
4/ MOS: VERIFY THAT THE SLITMASKS ARE CORRECTLY LOADED BEFORE THE DAY CREW LEAVES THE SUMMIT!! -> LRIS utilities -> slitmask imaging tool
OR MANUALLY:
Close the trapdoor.
Set grism = clear.
Set filter = G.
Switch on the Argon lamp.
Insert the slitmask you wish to image.
Set exposure time to 1 sec.
-----------------------------------VERY IMPORTANT----------------------------
IN CASE OF SPLIT NIGHT, TELL THE SUMMIT TO RELEASE THE TELESCOPE WITH LRIS AS SELECTED INSTRUMENT.
5/ Load starlist (Generate starlist from GUI or load it directly to /kroot/starlists/...)
6/ Determine the focus for the longslit, and MOS configurations (imaging focus is the same than MOS) . WRITE THE NUMBER FOR THE FOCUS of each configuration. RUN FOCUS ON YOUR SCIENCE CONFIGURATION!
1. Imaging focus -> dome lamps and the pinhole mask. Use the script. MANDATORY IF YOU ARE OBSERVING IN IMAGING MODE.This will use the "GOH_LRIS" mask (a grid of holes) to determine imaging focus. This is only necessary if you intend to do science imaging during the night. The MIRA telescope focus process can still determine the secondary tip and tilt even if the instrument is not focussed for imaging. If the OA runs MIRA focus without the proper afternoon imaging focus, that is OK. They should just use the autofoc procedure on the long slit or the MOS mask afterward to set the secondary focus (piston) for your spectroscopy observations.
-------> SELECT LEFT AMPLIFIER from the CMD... menu on the red side, so it reads both CCD.
2. Longslit focus -> new gui. Use arc lamps. Pushing the [OPTIONAL] ToO configuration button puts the system in a default configuration, not needed in general.
IF YOU ARE JUST DOING MOS OR LONGSLIT, YOU CAN ALSO ONLY TAKE FOCUS FOR LONGSLIT AND/OR MOS, and then do MIRA and AUTOFOC, having the longslit/mos focus on the instrument.
3. MOS spectroscopy focus -> new gui. Use arc lamps. IF YOU ARE JUST DOING MOS OR LONGSLIT, YOU CAN ALSO ONLY TAKE FOCUS FOR LONGSLIT AND/OR MOS, and then do MIRA and AUTOFOC, having the longslit/mos focus on the instrument.
--> Once the imaging focus has been determined for one filter, then for the rest of the filters -> LRIS UTILITIES > Print focus table; LRIS Utilities > Save Focus Table; LRIS Utilities > View Focus Table-----> MOS and Imaging have the same focus (the focal plane is curved for both). LONGSLIT have a different focus (not curved).
--> Independent focus for polarimetry mode.------------------------------------------WHEN DO I NEED TO DO FOCUS?-------------------------
----> For LONGSLIT -> ALWAYS! (if observers are doing longslit)
----> For MOS -> ALWAYS! and that focus is the same for imaging!
----> For IMAGING -> If you are doing science with imaging, you need to do the focus. If you are not doing imaging for science, you still need an approximation for the imaging focus for MIRA, you can get it by order of precision: 1/IMAGING FOCUS, 2/MOS FOCUS, 3/Using the FOCUS TABLE.
----> FOCUS TELESCOPE: MIRA at the beginning of the night, and AUTOFOC the rest of the night.
------> FOCUS: If you do longslit or MOS, in the first night also dO focus for imaging, OR do MIRA to calculate tip-tilts, and then AUTOFOC to move further or closer. For imagining, just do MIRA and not AUTOFOC.
------> Focus for imaging and MOS are the same.
7/ To calculate the focus in other filters, run: LRIS Utilities > print focus table, LRIS utilities > save focus table
8/ Determine central wavelength: in the red side, the choice of the grisms doesn't determine the central wavelength exactly, because they can be installed in different ports. Use the "grating" command to set up the grating in the exact wavelength:
9/ SETUP THE CORRESPONDING FOCUS IN XLRIS.
10/ Acquire arcs and flats: LRIS Utilities > Slitmask Calibration Tool (check manual procedure in the webpage: https://www2.keck.hawaii.edu/realpublic/inst/lris/checklist_pre_obs.html)
11/ Create setup files (save_state, restore_state) ---> in the webpage, it suggests to do save setup before focusing!! (optional) ----> CHECK IF IT SAVES THE TRAP DOOR STATE! Do it in the cdata directory!!
save_state /home/manuka/lris1/setups/600.sav
12/ Take arc and lamps cals: LRIS UTILITIES > slitmask calibration tool (only for MOS?)
List of all available commands: https://www.keck.hawaii.edu/realpublic/inst/lris/procs/index.html
-----> PUT WINDOWING IN RED SIDE!
----- NOTE MOS MODE -----
--> Blue and red side images of the mask are inverted (to see properly in ds9, do invert x). The real position is on the blue side.
--> Image all MOS masks to make sure they are correct. The observers have to click on the alignment boxes on the SAT for the alignment later in the night. When you click on each of the alignment boxes on the SAT/ID boxes images, then a .box file is generated with the coordinates of each of the alignment boxes.
--> MIRA CONFIGURATION: MENU -> LRIS ENGINEERING -> MIRA PRECONFIGURE (Save time if the OA needs to repeat the MIRA).
--- To take DOME FLATS, open the K1 FLAT LAMP, set power, and turn on. Take images on blue and red with the corresponding exp. time not to saturate.
----------- TO DO SKYFLATS ------------
Tell the OA that you want to do skyflats.
Take image of the sky
Move the telescope by an amount. Run the command: en 5 5 (east north 5 arcsec 5 arsec)
Proceed until you are happy with the skyflats