The VIMOS pipeline is designed to reduce raw science data

On Paranal, the quick-look pipeline makes an attempt to automatically reduce all science data. The reduction is performed using standard calibration products from a local calibration database and using, for MOS, the distorsion models written in the science frames header.

At QC Garching, IMAGING, MOS and IFU SCIENCE data taken in Service Mode are pipeline-reduced, using the best available calibration solutions (quality-checked and closest in time, following the calibration cascade).. For imaging the data reduction is pipeline supported for all filters. For spectroscopy the pipeline reduction is supported for the following GRISM + Order Sorting Filter combinations:

• LR_red + OS-red
• LR_blue + OS-blue
• MR + GG475
• HR_orange + GG435
• HR_red + GG475
• HR_blue + None

The following types of raw science data exist for the VIMOS

mode DPR TYPE template comment IMAGE OBJECT VIMOS_img_obs_Offset stare and jitter mode (jitter mode is not pipeline supported) MOS OBJECT VIMOS_mos_obs_Offset stare and jitter mode IFU OBJECT VIMOS_ifu_obs_Offset stare and jitter mode (jitter mode is not pipeline supported)         IMAGE SLIT,OBJECT VIMOS_mos_acq_Mask acquisition frames for MOS

Recipes and products

The following VIMOS raw science files are used to create science products (click here for a complete overview of science products and reduction recipes):

frame(s) recipe description product(s) IMAGE vmImObs   reduce single images and jitter stacks <prod>.fits, <, <prod>.tfits, <prod>.log MOS vmMosObs   reduce MOS single images and jitter stack 3x <prod>.fits, 2x <prod>.tfits, <prod>.log IFU vmifuscience   reduce IFU single images 2x <prod>.fits, <prod>.log

Association rules

For the reduction of science data calibration products are required. The selection of appropriate calibration products follows the association rules.

Naming scheme

The reduced science products have the same name of the raw file (or the first of the raw files) with the prefix "r.". If the products are more than one they are numbered in successive order. Tables have the suffix ".tfits", images ".fits". As an example: the reduction recipe for the raw MOS science frame VIMOS.2002-12-19T03:48:24.648.fits, produces 5 products, 3 images and 2 table called:

The successful execution of science reduction requires a complete set of calibration products available. All science data processed by QC Garching are reduced with a quality-checked set of calibration files which are usually generated from daytime calibrations taken immediately after the science night and produced following the calibration cascade.

All science products created by QC Garching follow the reduction cascade.