FXT Data Center

Observation Simulator

Exposure Time
Estimator

Filter & Window
Mode Evaluation

These simulation tools are based on the open source package SIXTE ( Dauser, T. et al. A&A, 630, A66(2019)) and HEASOFT tools. The simulation gives the results for one of the two FXT modules.In the current version, all calibration files, except for the background file (Zhang, et al., Astroparticle Physics, 137, (2022)102668) and the arf file, are obtained from the publicly released CALDB of eRosita. These calibration files include the rmf file, psf file, and vignetting file.

Observation Simulator

Source Info

Name:

Source Name, optional

*RA_src:

deg

*DEC_src:

deg

the Right Ascension of the source in J2000

the Declination of the source in J2000

*Flux:

erg/s/cm²

*nH:

x10²²cm⁻²

the absorbed source flux in units of erg/s/cm2 in the energy range of (Emin, Emax)

the column density of hydrogen, in units of 10^{22} cm-2

*Emin:

keV

*Emax:

keV

the reference lower-energe edge for Flux

the reference upper-energe edge for Flux

*Spectrum:

*Photon Index:

*Temperature: keV

the source spectral model, PL for powerlaw, BB for blackbody or the shape in the File you upload

Light Curve

Input Light Curve:

the light curve of the source. If chosen, you should upload a txt file, which contain two columns. The first column is the time in second, and the second column is the flux ratio relative to the reference flux given in Flux

Observation Info

Filter:

Mode:

the filter position on the filter wheel, it could be open,thin, medium

the readout mode of FXT pnCCD, FF (full frame mode), PW (partial windowed mode) or TM (Timing mode)

*RA_PNT:

deg

*DEC_PNT:

deg

the Right Ascension of the FXT pointing direction

the Declination of the FXT pointing direction

*Exposure:

the exposure duration of this source

Preliminary Analysis of the Results

Output

source rate (counts/s, 0.5-10keV)

background rate (counts/s, 0.5-10keV)

significance of the source

Quick Look

Light Curve

Image

Spectrum

Input Summary

Name

RA_src

DEC_src

Flux

Emin

Emax

Spectrum

Photon Index

Input Light Curve

Filter

Mode

RA_PNT

DEC_PNT

Exposure

Exposure Time Estimator

Source Info

*Flux:

erg/s/cm²

*nH:

x10²²cm⁻²

the absorbed source flux in units of erg/s/cm2 in the energy range of (Emin, Emax)

the column density of hydrogen, in units of 10^{22} cm-2

*Emin:

keV

*Emax:

keV

the reference lower-energe edge for Flux

the reference upper-energe edge for Flux

*Spectral Model:

*Temperature: keV

*Photon Index:

the source spectral model, PL for powerlaw, BB for blackbody

Observation Info

Filter:

Mode:

the filter position on the filter wheel, it could be open, thin, medium

the readout mode of FXT pnCCD, FF (full frame mode), PW (partial windowed mode) or TM (Timing mode)

Output Energy Range (keV):

the lower and upper energy bands of detected events used for analysis

Input & Output

*Input Signal-to-Noise Ratio:

Output Exposure Time (s)

signal-to-noise of source detection

* Input Exposure Time (s):

Output Signal-to-Noise Ratio

signal-to-noise of source detection

Or you can download the package below which uses Xspec fakeit to estimate the exposure or significance for arbitrary spectral shapes.

Filter & Window Mode Evaluation

To perform technical evaluation (on possibility of pile-up and optical loading) for the input source parameters and FXT configuration (i.e, different combinations of window modes and filters).

Source Info

Name:

Source Name, optional

*RA_src:

deg

*DEC_src:

deg

the Right Ascension of the source in J2000

the Declination of the source in J2000

*Flux:

erg/s/cm²

*nH:

x10²²cm⁻²

the absorbed source flux in units of erg/s/cm2 in the energy range of (Emin, Emax)

the column density of hydrogen, in units of 10^{22} cm-2

*Emin:

keV

*Emax:

keV

the reference lower-energe edge for Flux

the reference upper-energe edge for Flux

*Spectral Model:

*Temperature: keV

*Photon Index:

the source spectral model, PL for powerlaw, BB for blackbody

Optical Spectral Type:

Visible Magnitude:

the stellar spectral type of the source The Yale Bright Star Catalog (http://tdc-www.harvard.edu/catalogs/bsc5.html) is included in the calculations by default. If a specific type is assigned, both the source and the catalog will be calculated.

Observation Info

Filter:

Mode:

the filter position on the filter wheel, it could be open, thin, medium

the readout mode of FXT pnCCD, FF (full frame mode), PW (partial windowed mode) or TM (Timing mode)

RA_PNT:

deg

DEC_PNT:

deg

the Right Ascension of the FXT pointing direction

the Declination of the FXT pointing direction

Exposure:

the exposure duration of this source