X-SHOOTER Exposure Time Calculator

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X-SHOOTER Echelle Spectroscopy Mode Version 3.2.13

Description.

F.A.Q

Performance

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Input Flux Distribution

Blackbody:	T: Kelvin
Power Law	Index: F(λ) is proportional to λ^(Index)
Template Spectra:		Redshift Z:
Warning! Most of the template spectra currently do not cover the full wavelength range of X-SHOOTER!
Object Magnitude: Band:
Magnitudes are given per square arcsec for extended sources. Note that some template spectra are defined over a limited wavelength range and may not allow calculations for all instrument configurations. 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:

Spectral Format

Expected Counts

Graphs:

Input Spectr.

Efficiency

Obj

Sky

Imax

S/N