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X-SHOOTER Exposure Time Calculator

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X-SHOOTER Echelle Spectroscopy Mode Version 5.0.1
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 (Vega system): Band:
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

Days From New Moon:     Airmass:     Seeing: arcsec

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
   

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