Contents: IMG | SPEC

Typical observation and reduction problems are listed here.

Note:Until the end of P87 (September 2011) science data have been pipeline processed by QC Garching. The products were ingested into the Science Archive and delivered to the PIs. This service has been terminated with the begin of October 2011. The documentation of the VISIR science recipes is kept here for its heritage value. All statements about science processing by QC refer to the status before October 2011. Please, be advised that SCIENCE data have been processed with the up-to-date version of the pipeline and ESO does not assume any responsibility for the usefulness of reduced data. The adopted reduction strategy may not always be suitable for the scientific purpose of the observations.

Reduced image of SN1987A taken in filter B10.7, small pixel-field-of-view (0.075 arcsec/pix). The two positive and two negative images correspond to the chopping and nodding technique used to acquire this observation

The recipe combines the stack of raw science frames, estimates and subtracts background, performs de-stripping if needed (stripes are detector artifacts that appear occasionally). No final image reconstruction.

Products

QC parameters

As part of the quality control the following parameters are computed by the pipeline imaging recipe and their value are stored in the header of the reduced image. More information on the qc parameters can be found on the QC pages.

Reduced HR-slit spectrum of TW Hya. The combined positive spectrum is accompanied by the two negative beams due to chopping. The horizonal shades correspond to the sky lines.

The recipe combines the stack of raw science frames, estimates and subtracts background, performs destriping if needed (stripes are detector artifacts that appear occasionally), identifies sky lines, records the final spectrum in the fits table.

Products

QC parameters