Science Frame Product

Metadata

Data product name

DpdSirScienceFrame

Data product custodian

SIR

Name of the Schema file

euc-sir-ScienceFrame.xsd

Processing function using the data product

  • SIR

  • LE3

Proposed for inclusion in EAS/SAS

This product is proposed for inclusion in the SAS: yes

This product is used to store background subtracted frames. These frames will also contain the pointing correction computed by SIR.

Data product elements

Header

object of type sys:genericHeader

Data

object of type sir:scienceFrame

QualityFlags

object of type dqc:sqfPlaceHolder

Parameters

object of type ppr:genericKeyValueParameters

Detailed description of the data product

The Science Frame is produced at the end of the preprocessing steps and it represents data contained in the whole field of view. It is serialized into a multi extension FITS file. The primary extension does not contains data but only metadata about the pointing.

Data are stored into 48 extensions: 3 for each detector. The extensions are:

  • DETn.SCI: the extension containing dispersed image values on the n-th detector

  • DETn.VAR: the extension containing variance on image values

  • DETn.DQ: the extension containing pixel data quality. This layer is used to mark non-useful data values: bad pixels, cosmic rays, persistence and so on. The value of this layer is a bit mask which follow this convention:

    • 0: hot pixel

    • 1: cold pixel

    • 2: saturated pixel

    • 3: cosmic ray

    • 4: satellite trail

    • 5: interpolated pixel

    • 6: bleeding

    • 7: on-board masking

    • 8: bad pixel

    • 9: non-linear pixel

    • 10: persistent charge pixel

    • 11: ghost masking

    • 12: transient object

    • 13: extended object

    • 14: scattered light pixel

    • 15: charge injection

    • 16: near charge injection

DataContainer file name description

The following XML keywords:

  • Data.ObservationSequence.ObservationId (OBSID)

  • Data.ObservationSequence.PointingId (PTGID)

  • Data.ObservationSequence.DitherObservation (DITH)

  • Data.Grism (GWA)

  • Data.GrismWheelTilt (TILT)

are combined to create the DataContainer file name:

EUC_SIR_W-SCIFRM_BKGSUB_<OBSID>_<PTGID>_<DITH>_<GWA>_<TILT>_<TIMESTAMP>.fits.gz

Here below and example:

EUC_SIR_W-SCIFRM_BKGSUB_65879_270539_0_RGS000_0_20250410T105605.065923Z.fits.gz