X-SHOOTER Exposure Time Calculator

X-SHOOTER Echelle Spectroscopy Mode Version 6.1.0
Description
FAQ
 
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Target Input Flux Distribution

Template Spectrum Redshift
z =
Target Magnitude and Mag.System:   
= Vega
AB
Magnitudes are given per arcsec2 for extended sources
MARCS Stellar Model
Upload Spectrum
Blackbody Temperature: K
Power Law Index:           F(λ) ∝ λindex
Emission Line
Lambda: nm
Flux: 10-16 ergs/s/cm2 (per arcsec2 for extended sources)
FWHM: nm



Spatial Distribution:
Point Source    Extended Source

Sky Conditions

Moon phase: days from new Moon
Airmass:
Seeing/Image Quality:
For point sources, the resulting Image Quality FWHM is approximated by a gaussian in the ETC considering the transfer functions of the atmosphere, telescope and instrument. See the helpfile for details.
Seeing: arcsec FWHM in V-band at zenith (use this value in the proposal)
              Probability ---% of realising the seeing ≤ 0.80 arcsec
IQ: arcsec FWHM at the airmass and wavelength of observation (to be used for the OB constraint set)
              The corresponding seeing and probability will be indicated in the ETC output page
Image Quality is not a parameter in AO modes

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

Include exposure times for S/N: (currently not enabled for NIR)
Tables:  Toggle All / No Tables
Spectral Format
Expected Counts
       
Graphs:  Toggle All / No Graphs
Input Spectrum
Efficiency
Obj
Sky
Maximum Intensity
S/N