SINFONI: calibration data

SINFONI:
calibration data

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general

SINFONI

CALIBRATION DATA: GENERAL

Calibration data are taken for two purposes:

to calibrate SCIENCE data
to measure and control the instrumental status

Generally SINFONI calibration data are taken as daytime calibrations. Telluric standard stars and Point Spread Function calibration stars (PSF-stars) are generally observed during the night, as described by the calibration plan (see the SINFONI User's Manual for details). If explicitly requested by the user, night time calibrations may also be obtained as part of the Observing Block (OB) which generates the science data (so-called "attached calibrations").

All calibration data taken in SINFONI are processed by QC Garching to obtain calibration solutions. These solutions come as

calibration product fits file frames (for example, master darks or master lamp flat frames)
calibration product fits tables (for example, slitlet position tables, distortion correction tables, wavelength solution tables, etc.)

TYPES OF RAW CALIBRATION DATA

The following types of raw calibration data exist for the SINFONI IFU mode

frame	DPR TYPE	Purpose	typical number taken per night and setting
DARK	DARK	detector status, dark level, RON, hot (high dark current) pixels	3
LAMP FLAT	FLAT,LAMP	fixed pattern noise, vignetting, bad pixels	10
WAVE	WAVE,LAMP	wavelength calibration, position of slitlets	2
DISTORTION	DISTORTION,FIBRE,NS DISTORTION,WAVE,NS DISTORTION,FLAT,NS	optical distortion, distances between successive slitlets	75 2 2
LINEARITY	LAMP,LINEARITY	Linearity, bad (non-linear) pixels, fixed pattern noise	10
STANDARD STAR	STD and SKY,STD	standard stars for telluric features	2
PSF	PSF-CALIBRATOR and SKY,PSF-CALIBRATOR	PSF, Strehl ratio	2

CALIBRATION PRODUCTS

Complete overview of calibration files and recipes

raw frame(s)	template/recipe	description	products, PRO.CATG
DARK	SINFONI_ifu_cal_Dark sinfo_rec_mdark	create a master dark from set of input raw frames and calculates the RON, generate a hot pixel map.	MASTER_DARK BP_MAP_HP
FLAT LAMP	SINFONI_ifu_cal_mflat sinfo_rec_mflat	Create a master lamp flat and a bad (large deviating) pixel map BP_MAP_NO. Combine with BP_MAP_DI to generate a MASTER bad pixel map.	MASTER_LAMP_FLAT BP_MAP_NO MASTER_BP_MAP
WAVE LAMP	SINFONI_ifu_cal_Arcs sinfo_rec_wavecal	define high accuracy detector response distribution, only SW	WAVE_MAP SLIT_POS
LINEARITY	SINFONI_ifu_cal_Detlin sinfo_rec_detlin	Fit each pixel by a nth-order polynomial (n=2) and save coefficients in COEFFS_CUBE. Combine outliers map with REF_PIXEL_MAP in BP_MAP_DI.	BP_MAP_DI COEFFS_CUBE
DISTORTION	SINFONI_ifu_cal_NStest sinfo_rec_distortion	Derive optical distortion coefficients and distances of consecutive slits.	DISTORTION SLITLET_DISTANCES
STD	SINFONI_ifu_cal_STD sinfo_rec_jitter	Cube reconstructed and sky-subtracted Telluric Standard star. Extract spectrum, determine instrumental efficiency and response	COADD_STD SPECTRA
PSF	SINFONI_ifu_cal_PSF sinfo_rec_jitter	Collapse PSF reconstructed cube , determine Strehl ratio and obtain the encircled energy	MASTER_PSF AO_PERFORMANCE

Naming scheme

After production and certification, the calibration products are renamed with a more user-friendly scheme which includes type, creation date and relevant setting parameters.

Description of naming scheme

CALIBRATION CASCADE

The calibration of SINFONI science frames requires a cascading scheme where the mutual dependencies of products and raw frames have to be respected. Some products (dark, distortion) can be produced from raw files only, but most products require the prior generation of other calibration products. The proper sequence of all these production steps is called the calibration cascade. It is described here.

Within that cascade, all products are checked with respect to their quality and their relationship in time. This means e.g. that a master flat is not only generated using an arbitrary quality-checked order table, but that specific table is chosen which at the moment of processing is closest in time.

All products created by QC Garching follow the calibration cascade.

STATIC CALIBRATION TABLES

The following static (i.e. the ones not being regularly processed from raw calibration data) calibration images and tables are required for SINFONI data processing:

CODE	TYPE OF FILE	PRO_CATG	EXAMPLE
GARC	arc line reference table (J, H, H+K, K bands)	REF_LINE_ARC	SI_GARC_050331A_H+K.fits
GBPM	reference bad pixel map (image)	REF_BP_MAP	SI_GBPM_050331A_REF_BP_MAP.fits
GCOL	position of first slitlet column (table)	FIRST_COL	SI_GCOL_050331A_FIRST_COL.fits
GDRS	first guess wavelength dispersion solution table	DRS_SETUP_WAVE	SI_GDRS_050331A_DRS_SETUP_WAVE.fits
GATM	atmospheric dispersion correction table	ATM_REF_CORR	SI_GATM_REF_CORR_J_025.fits *

*Note: The atmospheric dispersion correction tables exist for all grisms (S1_J, S2_H, S3_K, and S4_H+K) and for the 25 and 100 mas pixel scales.
The 250 mas pixel is not corrected, since at this pixel scale the maximal shift due to atmospheric dispersion is less than one pixel. The correction of
data cubes for atmospheric dispersion is implemented in SINFONI pipeline versions after 2.0.9.

They are included in the Service Mode delivery for SINFONI data.

ACTUAL PROBLEMS AND ISSUES

SINFONI pipeline problems and instrument issues are documented in the ServiceMode page.