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JWST/NIRISS Simulated Data

Created by: Kevin Volk, Gabriel Brammer, Deepashri Thatte, Joseph Filippazzo & Jason Rowe

The following data consist of simulations of four observing configurations of the JWST Near-Infrared Imager and Slitless Spectrograph (NIRISS) instrument:

• Imaging
• Aperture-Masking Interferometry (AMI)
• Wide-Field Slitless Spectroscopy (WFSS)
• Single-Object Slitless Spectroscopy (SOSS)

The simulations are summarized below. For details, see the extensive description of the NIRISS_Data_Simulations from the team, and the even more detailed description of the WFSS simulations in the README file. The simulations include the following effects:

• Detector noise, bad pixels, and bias drift
• Spectral traces and spectral dispersions as measured in ground testing
• Realistic PSFs, created by the WebbPSF software
• The expected sensitivities of the various NIRISS modes

Note that detector non-linearity is not simulated. All simulations adopt NISRAPID read-out (NB: each frame constitutes a separate group in the integration). Detector characteristics match what was measured in ground-testing.

The following instrument configurations and targets were simulated:

Observing Configurations & Operating Modes

Configuration	Optical Element	Read Mode	Scene
Imaging	F200W	Full	4-point dither within the PHAT survey of M31
AMI	P750L	Subarray (80×80)	Binary star, and a star + exoplanet system
WFSS	F200W+GR150C	Full	4-point dither of the GOODS-S field
	F200W+GR150R
SOSS	F1130W	Subarray (2048×256)	Planet host GJ 436 (aka Ross 905)

Data Files

Use the links in the following tables to download the files of interest. The contents of the *_uncal files contain data as processed to Level-1b[1] (i.e., assembled image, ready to be calibrated), including associated metadata. The contents of the *_rate and *_rateints files contain data as processed to Level-2a (i.e., countrate or countrate per integration images, respectively, derived from ramps and ready for instrument signature removal).

NIRISS Imaging Data

File	Size	Dither Pos.	Description
Imaging of M31 in F200W
m31_pos1_PS.list.gz	5 MB	1	Point-source list (ASCII, gzipped)
niriss_m31_pos1_uncal.fits	206 MB		Uncalibrated image
niriss_m31_pos1_rate.fits	50 MB		Calibrated rate image
m31_pos2_PS.list.gz	5 MB	2	Point-source list (ASCII, gzipped)
niriss_m31_pos2_uncal.fits	206 MB		Uncalibrated image
niriss_m31_pos2_rate.fits	50 MB		Calibrated rate image
m31_pos3_PS.list.gz	5 MB	3	Point-source list (ASCII, gzipped)
niriss_m31_pos3_uncal.fits	206 MB		Uncalibrated image
niriss_m31_pos3_rate.fits	50 MB		Calibrated rate image
m31_pos4_PS.list.gz	5 MB	4	Point-source list (ASCII, gzipped)
niriss_m31_pos4_uncal.fits	206 MB		Uncalibrated image
niriss_m31_pos4_rate.fits	50 MB		Calibrated rate image
Full Data Set
sim_niss_img_full.tgz	302 MB	All	Bundle of all .fits Imaging files

NIRISS WFSS Data

File	Size	Opt. Element	Dither Pos.	Description
Ref. Imaging + Spectra of GOODS-S
niriss_F200W_image_pos1_uncal.fits	130 MB	F200W	1a	Uncalibrated direct image
niriss_F200W_image_pos1_rate.fits	50.4 MB			Countrate direct image
niriss_F200W_gr150r_pos1_uncal.fits	206 MB	GR150R		Uncalibrated spectrum
niriss_F200W_gr150r_pos1_rate.fits	50.4 MB			Countrate spectrum
niriss_F200W_gr150r_pos2_uncal.fits	206 MB	GR150R	2a	Uncalibrated spectrum
niriss_F200W_gr150r_pos2_rate.fits	50.4 MB			Countrate spectrum
niriss_F200W_gr150r_pos3_uncal.fits	206 MB	GR150R	3a	Uncalibrated spectrum
niriss_F200W_gr150r_pos3_rate.fits	50.4 MB			Countrate spectrum
niriss_F200W_gr150r_pos4_uncal.fits	206 MB	GR150R	4a	Uncalibrated spectrum
niriss_F200W_gr150r_pos4_rate.fits	50.4 MB			Countrate spectrum
niriss_F200W_image_pos2_uncal.fits	130 MB	F200W		Uncalibrated direct image
niriss_F200W_image_pos2_rate.fits	130 MB			Countrate direct image
niriss_F200W_gr150c_pos1_uncal.fits	206 MB	GR150C	1b	Uncalibrated spectrum
niriss_F200W_gr150c_pos1_rate.fits	50.4 MB			Countrate spectrum
niriss_F200W_gr150c_pos2_uncal.fits	206 MB	GR150C	2b	Uncalibrated spectrum
niriss_F200W_gr150c_pos2_rate.fits	50.4 MB			Countrate spectrum
niriss_F200W_gr150c_pos3_uncal.fits	206 MB	GR150C	3b	Uncalibrated spectrum
niriss_F200W_gr150c_pos3_rate.fits	50.4 MB			Countrate spectrum
niriss_F200W_gr150c_pos4_uncal.fits	206 MB	GR150C	4b	Uncalibrated spectrum
niriss_F200W_gr150c_pos4_rate.fits	50.4 MB			Countrate spectrum
niriss_F200W_image_pos4_uncal.fits	130 MB	F200W		Uncalibrated direct image
niriss_F200W_image_pos4_rate.fits	130 MB			Countrate direct image
Full Data Set
sim_niss_wfss_full.tgz	829 MB	All	All	Bundle of all WFSS files (including config files)

NIRISS SOSS Data

File	Size	Integrations	Description
Timeseries Spectra of JG 436
niriss_soss_gj436_exposure_signal.fits	698 MB	333	Countrate timeseries spectra of JG 436
signal_comparison.txt	15 KB	—	Mean signal comparison (ASCII)

NIRISS AMI Data

File	Size	Filter	Description
AMI Imaging of a Simple Binary
niriss_binary_f380m_uncal.fits	10.2 MB	F380M	Uncalibrated image
niriss_binary_f380m_rate.fits	118 KB		Countrate image
niriss_binary_f380m_rateints.fits	662 KB		Countrate per integration image
niriss_binary_f430m_uncal.fits	16.2 MB	F430M	Uncalibrated image
niriss_binary_f430m_rate.fits	118 KB		Countrate image
niriss_binary_f430m_rateints.fits	585 KB		Countrate per integration image
niriss_binary_f480m_uncal.fits	19.1 MB	F480M	Uncalibrated image
niriss_binary_f480m_rate.fits	118 KB		Countrate image
niriss_binary_f480m_rateints.fits	507 KB		Countrate per integration image
AMI Imaging of a Binary Calibrator
niriss_binary_cal_f380m_uncal.fits	10.2 MB	F380M	Uncalibrated image
niriss_binary_cal_f380m_rate.fits	118 KB		Countrate image
niriss_binary_cal_f380m_rateints.fits	662 KB		Countrate per integration image
niriss_binary_cal_f430m_uncal.fits	16.2 MB	F430M	Uncalibrated image
niriss_binary_cal_f430m_rate.fits	118 KB		Countrate image
niriss_binary_cal_f430m_rateints.fits	585 KB		Countrate per integration image
niriss_binary_cal_f480m_uncal.fits	19.1 MB	F480M	Uncalibrated image
niriss_binary_cal_f480m_rate.fits	118 KB		Countrate image
niriss_binary_cal_f480m_rateints.fits	507 KB		Countrate per integration image
AMI Imaging of an Exoplanet Host
niriss_ami_hr8799_new_short_f480m_uncal.fits	150 MB	F480M	Uncalibrated image
niriss_ami_hr8799_new_short_f480m_rate.fits	118 KB		Countrate image
niriss_ami_hr8799_new_short_f480m_rateints.fits	7.72 MB		Countrate per integration image
AMI Imaging of an Exoplanet Calibration Star
niriss_ami_hd217783_new_short_f480m_uncal.fits	334 MB	F480M	Uncalibrated image
niriss_ami_hd217783_new_short_f480m_rate.fits	118 KB		Countrate image
niriss_ami_hd217783_new_short_f480m_rateints.fits	7.72 MB		Countrate per integration image
Full Data Set
sim_niss_ami_full.tgz	148 MB	All	Bundle of all AMI .fits files

[1] The format and organization of the raw data and metadata in the FITS files is the same as that expected for Level-1b products (ca. 2017 Mar). Thus, these files could be run through the JWST pipeline.

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