Reducing GIANO-B spectra with IRAF. The GIANOTOOLS handbook

Abstract

GIANO is a near infrared echelle spectrograph operating at Nasmyth focus A of Telescopio Nazionale Galileo. It is a second generation instrument and allows obtaining spectra that cover most of the range 0.9--2.5 mum with a single exposure. The spectral interval is covered through 49 orders and only a few small windows fall outside the detector. GIANO-B is an upgrade of GIANO and has been available since 2017. Unlike GIANO, it is not fibre-fed but light is now transferred to the slit through pre-slit optics. This document is the updated version of the first ``Reducing GIANO Spectra'' handbook and explains how to reduceand extract GIANO-B calibrated spectra by using routines available in any basic installation of IRAF, the Image Reduction and Analysis Facility developed by the NOAO, plus the suite GIANOTOOLS of ad-hoc scripts, the latest version of which can be obtained from the author of this handbook. IRAF is one of the most commonly used scientific suites of software packages for reducing and analysing images and spectra, freely downloadable, and offering many routines which are both fully optimised and tested. Its versatile Command Language also allows scripting and easy customisation.