CALPRODUCT-NS-004: NISP-S Large-Scale Flat¶
Parent requirement¶
Not yet in the CalCD-B
Scheduling¶
Monthly
Time-critical¶
No
Dependencies¶
None
Objective¶
Reconstruct matching spectroscopic large-scale flat fields for all four grisms from the CALBLOCK-F-001: Self Calibration observations.
Fulfilled by¶
Data volume¶
TBD
Processing input¶
Ground Processing Input Data: BPM
Data Description:
Processing method¶
By comparing fluxes of small chunks of wavelengths in stellar spectra from a set of widely dithered pointings, a large-scale illumination correction is calculated. This calibration removes simultaneously the large-scale non-uniformity present in the NI-CU beam (CALPRODUCT-NI-010: NISP LED Flats) as well as any vignetting effects from the telescope and instrument optics (NI-CU illuminates the focal plane array directly, without passing through any optics).
The exact procedure is TBW. In principle, the same code as for the CALPRODUCT-NP-003: NISP-P Large-Scale Flat can be used, once the fluxes of the spectral fragments have been extracted.
Processing output¶
Large-scale flat fields for all grisms. Trend analysis.
Required accuracy, constraints¶
TBD
Processing tools¶
Large-scale flat-field pipeline
Quality control parameters¶
DataModel: https://gitlab.euclid-sgs.uk/
Contact person¶
NISP-S calibration scientist