Non-science products

Dark exposure: dark

Dark exposures processed by the calwebb_dark pipeline result in a product that has the same structure and content as the ramp product described above. The details are as follows:

HDU

EXTNAME

HDU Type

Data Type

Dimensions

0

N/A

primary

N/A

N/A

1

SCI

IMAGE

float32

ncols x nrows x ngroups x nints

2

PIXELDQ

IMAGE

uint32

ncols x nrows

3

GROUPDQ

IMAGE

uint8

ncols x nrows x ngroups x nints

4

ERR

IMAGE

float32

ncols x nrows x ngroups x nints

5

GROUP

BINTABLE

N/A

variable

6

INT_TIMES

BINTABLE

N/A

nints (rows) x 7 cols

ZEROFRAME*

IMAGE

float32

ncols x nrows x nints

REFOUT*

IMAGE

uint16

ncols/4 x nrows x ngroups x nints

ASDF

BINTABLE

N/A

variable

  • SCI: 4-D data array containing the pixel values. The first two dimensions are equal to the size of the detector readout, with the data from multiple groups (NGROUPS) within each integration stored along the 3rd axis, and the multiple integrations (NINTS) stored along the 4th axis.

  • PIXELDQ: 2-D data array containing DQ flags that apply to all groups and all integrations for a given pixel (e.g. a hot pixel is hot in all groups and integrations).

  • GROUPDQ: 4-D data array containing DQ flags that pertain to individual groups within individual integrations, such as the point at which a pixel becomes saturated within a given integration.

  • ERR: 4-D data array containing uncertainty estimates on a per-group and per-integration basis.

  • GROUP: A table of meta data for some (or all) of the data groups.

  • INT_TIMES: A table of begining, middle, and end time stamps for each integration in the exposure.

  • ZEROFRAME: 3-D data array containing the pixel values of the zero-frame for each integration in the exposure, where each plane of the cube corresponds to a given integration. Only appears if the zero-frame data were requested to be downlinked separately.

  • REFOUT: The MIRI detector reference output values. Only appears in MIRI exposures.

  • ADSF: The data model meta data.

Charge trap state data: trapsfilled

The persistence step in the calwebb_detector1 pipeline produces an image containing information on the number of filled charge traps in each pixel at the end of an exposure. Internally these data exist as a TrapsFilledModel data model, which is saved to a trapsfilled FITS product. The FITS file has the following format:

HDU

EXTNAME

HDU Type

Data Type

Dimensions

0

N/A

primary

N/A

N/A

1

SCI

IMAGE

float32

ncols x nrows x 3

2

ASDF

BINTABLE

N/A

variable

  • SCI: 3-D data array giving the number of charge traps per pixel, with each plane corresponding to a different trap family.

  • ADSF: The data model meta data.

WFS&C combined image: wfscmb

The wfs_combine step in the calwebb_wfs-image3 pipeline combines dithered pairs of Wavefront Sensing and Control (WFS&C) images, with the result being stored in a wfscmb product. Unlike the drizzle methods used to combine and resample science images, resulting in an i2d product, the WFS&C combination is a simple shift and add technique that results in a standard imaging FITS file structure, as shown below.

HDU

EXTNAME

HDU Type

Data Type

Dimensions

0

N/A

primary

N/A

N/A

1

SCI

IMAGE

float32

ncols x nrows

2

ERR

IMAGE

float32

ncols x nrows

3

DQ

IMAGE

uint32

ncols x nrows

4

ASDF

BINTABLE

N/A

variable

  • SCI: 2-D data array containing the pixel values, in units of surface brightness.

  • ERR: 2-D data array containing uncertainty estimates for each pixel.

  • DQ: 2-D data array containing DQ flags for each pixel.

  • ADSF: The data model meta data.