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X-SHOOTER Exposure Time Calculator

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X-SHOOTER Echelle Spectroscopy Mode Version 6.0.0
Description.
F.A.Q
 
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Input Flux Distribution

Blackbody: T: Kelvin
Power Law Index:  F(λ) is proportional to λ(Index)

Template Spectra:

Redshift z: The redshift is only applicable with the option Template Spectra.
Most of the template spectra currently do not cover the full wavelength range of X-SHOOTER
Object Magnitude: Band: Vega AB
Magnitudes are given per square arcsec for extended sources. The object magnitude is not taken into account for single line sources.
Single line : λ:   FWHM: nm   Flux: 10-16 ergs/s/cm2 (per arcsec2 for extended sources)

Spatial Distribution:
Point Source    Extended Source

Sky Conditions

Moon phase: days from new Moon
Airmass:
Seeing: arcsec FWHM in V-band at zenith (use this value in the proposal). The seeing is irrelevant for extended sources.
Probability 60% for a seeing smaller or equal to the requested value
For point sources, the resulting Image Quality FWHM is modeled by the ETC considering the transfer functions of the atmosphere, telescope and instrument. See the helpfile for details.

Instrument Setup

Arm selection, Exposure Times and Detector modes:
Arm
Slit Width
Exp.Time
NDIT

NEXP or NINT

Detector Mode
(gain) (spectral×spatial binning) (readmode)
UVB:
Texp: s
 
NEXP:
VIS:
Texp: s
 
NEXP:
NIR:
DIT: s
NDIT:
NINT:
 

Note! The current version of the ETC includes the 0.6" and 0.9" NIR slits without the K band blocking filter. For the preliminary performances of the new 0.6" and 0.9" slits with the K band blocking filter please refer to the X-shooter User Manual.

In UVB and VIS, the total exposure time is the product of DIT (Detector Integration Time) and NEXP (Number of EXPosures): T = Texp × NEXP.

In NIR, the total exposure time is the product of DIT (Detector Integration Time), NDIT (Number of DITs) and NINT (Number of INTegrations): T = DIT × NDIT × NINT.


Results

Tables:  Toggle All / No Tables
Spectral Format
Expected Counts
       
Graphs:  Toggle All / No Graphs
Input Spectrum
Efficiency
Obj
Sky
Maximum Intensity
S/N
Details of Image Quality Calculations (only for pointsources)
      

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