Like for all astronomical data, the reduction of XSHOOTER calibration
frames requires a cascading scheme where the mutual dependencies of
products and raw frames have to be respected. Master Biases and DARKs
can be produced from raw files only, but all the other products require
the prior generation of other calibration products. The proper sequence
of all these production steps is called the
The XSHOOTER calibration plan is subject of improvemements.
Start of operations
The calibration plan includes now the regular acquisition of flux standard stars in offset mode (one object and one sky frame).
XSHOOTER fits file names have a new prefix. It changed from SHOOT to XSHOO.
flux standard stars are acquired in nodding mode (two object frames). Before flux standard stars have been take in offset mode (one object and one sky frame).
The calibration plan concerning telluric standard stars is changed. From now on telluric standard stars are acquired in nodding mode with two frames per template. Before telluric standard stars have been acquired in stare mode with only one raw frame.
DFO: Telluric standard star association blocks contain a response function to be flux calibrated.
science and telluric standard star spectra are calibrated using the individual response curve derived from the closest in time flux standard star. Before a master response curve was used.
The calibration plan concerning telluric standard stars is changed. While before telluric standard stars have bee acquired for every science OB within +- 2 hours and within +-0.1 aim mass difference, one telluric standard star is from now on taken once a time in a night. The nodding template takes several exposures covering all available slit widths, including the 5'' slit.
Static calibration tables (the ones not being regularly processed from raw calibration data)
come as FITS tables and are available through the calSelector archive service.
static bad pixel map
list of sky lines
atmospheric extinction table
response function fit points
absolute fluxes of standard stars
telluric models for flux std
There is one SPECTRAL_FORMAT_TAB_UVB and one SPECTRAL_FORMAT_TAB_VIS for all slits. Only for the NIR arm, which ignores
two orders for the two K-band suppressing slits, the SPECTRAL_FORMAT_TAB_NIR splits up per slit.
There is no TELL_MOD_CAT_UVB, no telluric correction is required to derive the response function in the UVB arm.