Keck NIRES
Overview
This file summarizes several instrument specific settings that are related to the Keck/NIRES spectrograph.
PypeIt File
Here is some advice on how to setup your PypeIt Reduction File. First, run:
pypeit_setup -r absolute_path -s keck_nires -b -c A
where -b indicates that the data use sky subtraction and the calib, comb_id, and bkg_id columns
are added to the Data Block. See pypeit_setup and A-B image differencing for the syntax used
for the data in these columns and how PypeIt uses them.
Here is an example of the Data Block of the PypeIt file:
# Data block
data read
path raw/
filename | frametype | ra | dec | target | dispname | decker | binning | mjd | airmass | exptime | dithpat | dithpos | dithoff | frameno | calib | comb_id | bkg_id
NR.20201128.22795.fits | arc,science,tilt | 25.8722004481703 | -1.77957177216147 | eris_28 0620 | spec | 0.55 slit | 1,1 | 59181.263841269 | 1.13659692763023 | 300.0 | ABBA | A | 5.0 | 49 | 1 | 1 | 2
NR.20201128.23132.fits | arc,science,tilt | 25.8702924043135 | -1.77752676502195 | eris_28 0620 | spec | 0.55 slit | 1,1 | 59181.2677371023 | 1.12734707860924 | 300.0 | ABBA | B | -5.0 | 50 | 1 | 2 | 1
NR.20201128.23467.fits | arc,science,tilt | 25.8702636585777 | -1.7775294833213 | eris_28 0620 | spec | 0.55 slit | 1,1 | 59181.2716109449 | 1.11888914544008 | 300.0 | ABBA | B | -5.0 | 51 | 1 | 2 | 1
NR.20201128.23803.fits | arc,science,tilt | 25.8720347222654 | -1.77964895855717 | eris_28 0620 | spec | 0.55 slit | 1,1 | 59181.2754992551 | 1.11131755069033 | 300.0 | ABBA | A | 5.0 | 52 | 1 | 1 | 2
NR.20201128.07158.fits | lampoffflats | 58.0 | 45.0 | unknown | spec | 0.55 slit | 1,1 | 59181.0828553894 | 1.41291034446565 | 100.0 | NONE | None | 0.0 | 21 | all | -1 | -1
NR.20201128.07382.fits | lampoffflats | 58.0 | 45.0 | unknown | spec | 0.55 slit | 1,1 | 59181.0854467088 | 1.41291034446565 | 100.0 | NONE | None | 0.0 | 22 | all | -1 | -1
NR.20201128.07496.fits | lampoffflats | 58.0 | 45.0 | unknown | spec | 0.55 slit | 1,1 | 59181.0867630282 | 1.41291034446565 | 100.0 | NONE | None | 0.0 | 23 | all | -1 | -1
NR.20201128.05431.fits | pixelflat,trace | 58.0 | 45.0 | unknown | spec | 0.55 slit | 1,1 | 59181.062862681 | 1.41291034446565 | 100.0 | NONE | None | 0.0 | 11 | all | -1 | -1
NR.20201128.05549.fits | pixelflat,trace | 58.0 | 45.0 | unknown | spec | 0.55 slit | 1,1 | 59181.0642262227 | 1.41291034446565 | 100.0 | NONE | None | 0.0 | 12 | all | -1 | -1
NR.20201128.05665.fits | pixelflat,trace | 58.0 | 45.0 | unknown | spec | 0.55 slit | 1,1 | 59181.0655779588 | 1.41291034446565 | 100.0 | NONE | None | 0.0 | 13 | all | -1 | -1
data end
frametype is automatically assigned to each frame using the values of various header keywords,
see Automated typing of NIRES frames.
The dither pattern, position and offset associated to each fame is reported here. PypeIt tries to automatically
set the calib, comb_id, and bkg_id using the dither information (see Automated sorting of Keck/NIRES frames by instrument configuration); however,
the user can edit these columns according to the preferred reduction.
Calibrations
Flat Fielding
The NIRES calibration GUI/scripts provide the option to take flats with the lamps off.
PypeIt is able to recognize those frames and it will assign them the
lampoffflats frame type. Whenever lampoffflats frames are identified in the PypeIt file, PypeIt
will subtract them from the frames taken with the lamps on before creating the
Edges and Flat
frames. The user is responsible for ensuring that the lampoffflats frames
in the PypeIt file have the same exposure times as the trace and pixelflat frames.
Additional Reading
Here are additional docs related to Keck/NIRES. Note all of them are related to the development of PypeIt for use with NIRES data: