INTRODUCTION

The FORS1 pipeline is designed to reduce raw science data.

On Paranal, the quick-look pipeline makes an attempt to automatically reduce all science data taken in IMAGING and LSS/MOS modes. The reduction is performed using standard calibration solutions from a local calibration database which is refreshed every one month.

At QC Garching, all IMAGING and LSS/MOS science data taken in Service Mode are pipeline-reduced, using the best available calibration solutions, quality-checked and closest in time, following the reduction cascade. The products of science reduction are also quality-checked. If any irregularity in the reduced data is found, an attempt is made to improve on this. If not possible, information about the poor quality is made available in the SM package. Present policy is to not suppress these data. Please note that ESO is not assuming any responsibility in respect to the usefulness of the reduced data. The adopted reduction strategy may not be suitable for the scientific purpose of the observations.

RAW SCIENCE DATA

The following types of raw science data exist for the FORS1 supported modes.

Frame Type	DPR Type	DPR Tech
SCIENCE_IMG	OBJECT	IMAGE
SCIENCE_LSS	SKY	SPECTRUM
SCIENCE_MOS	SKY	MOS

REDUCED SCIENCE DATA AND PRODUCTS

The following types of reduced data and products are produced for the FORS1 supported modes

Frame Type	Recipe	Description	Products
SCIENCE_IMG	fors_img_science	reduce single images	reduced image
SCIENCE_LSS SCIENCE_MOS	fors_science	reduce single images and apply wavelength calibration	extracted, sky-subtracted spectra, corrected for distortions

REDUCTION CASCADE

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

NAMING SCHEME

After production and certification, the calibration products are renamed after a scheme which includes type, OB ID, creation date and relevant FORS1 settings.