FORS1 Pipeline: Recipe for SCREEN Flat Reduction

FORS1 Pipeline
Recipe for SCREEN Flat Reduction

QUALITY CONTROL HOME
CAL \| HC \| refs \| QC
FORS1 QC
FORS1 QC HOME
TOC
Trending & QC1
general info
trending & QC1
known problems

FORS1 Health Checks
History
general information
interventions
product completeness
Pipeline
general info
calib data
science data
product names
assoc map
problems
Data Management
general info
Service Mode
QC links:
QC home
Data Products
calChecker
HealthChecks
Reference Frames

QC1 database
Paranal autrep database
(ESO internal)
[best viewing with style sheets and javascript enabled]

recipe name:FORS_IMG_SCREEN_FLAT
input frames:SCREEN_FLAT_IMG
associated templates: FORS1_img_cal_scrflat

purpose: Creates a master screen flat from a set of screenflat images.

description: After bias subtraction, the input frames are averaged. The overscan regions, if present, are removed from the result. The combined frame is then normalised dividing it by its large scale illumination trend. The large scale trend is obtained by applying a median filter with a large kernel. The master frame has 2 extensions, with the actual product being in the first extension and its errors being in the second extension.

At the end, the new master frame is compared with the corresponding certified master frame from the calibration database.

products:

Master PS GIF Header

F1_MSFI_080412A_BBESS_C1_200Klo_2x2s

F1_MSFI_080412A_BBESS_C2_200Klo_2x2s