ESO
SINFONI Pipeline User Manual
Doc:
VLT-MAN-ESO-19500-3600
Issue:
Issue 1.0
Date:
Date 2005-10-19
Page:
17 of 88
4.2
An introduction to Gasgano and EsoRex
Before being able to call pipeline recipes on a set of data, the data must be opportunely classified, and associated
with the appropriate calibrations. The Data Classification consists of tasks such as: "What kind of data am
I?", e.g., BIAS, "to which group do I belong?", e.g., to a particular Observation Block or template. Data
Association is the process of selecting appropriate calibration data for the reduction of a set of raw science
frames. Typically, a set of frames can be associated if they share a number of properties, such as instrument and
detector configuration. As all the required information is stored in the FITS headers, data association is based
on a set of keywords (called "association keywords") and is specific to each type of calibration.
The process of data classification and association is known as data organisation.
An instrument pipeline consists of a set of data processing modules that can be called from different host
applications, either from the command line with Esorex, from the automatic data management tools available
at Paranal, or from the graphical Gasgano tool.
Gasgano is a data management tool that simplifies the data organisation process, offering automatic data clas-
sification and making the data association easier (even if automatic association of frames is not yet provided).
Gasgano determines the classification of a file by applying an instrument specific rule, while users must pro-
vide this information to the recipes when they are executed manually using Esorex from the command line. In
addition, Gasgano allows the user to execute directly the pipeline recipes on a set of selected files.
4.2.1
Using Gasgano
To get familiar with the SINFONI pipeline recipes and their usage, it is advisable to begin with Gasgano,
because it provides a complete graphic interface for data browsing, classification and association, and offers
several other utilities such as easy access to recipes documentation and preferred data display tools.
Gasgano can be started from the system prompt in the following way:
gasgano &
The Gasgano main window will appear. On Figure 4.2.1 (next page), a view on a set of SINFONI IFU data
is shown as an example. Gasgano can be pointed to the directories where the data to be handled are located
using the navigation panels accessible via the Add/Remove Files entry of the File menu (shown on the upper
left of the figure).
The data are hierarchically organised as preferred by the user. After each file name are shown the classification,
the instrument setup id (which indicates the band), the instrument pre-optic (which indicates the camera setting),
the template exposure number and the number of exposures in the template, and the value of the DPR.TYPE.
More information about a single frame can be obtained by clicking on its name: the corresponding FITS file
header will be displayed on the bottom panel, where specific keywords can be opportunely filtered and searched.
Images and tables may be easily displayed using the viewers specified in the appropriate Preferences fields.
Frames can be selected from the main window for being processed by the appropriate recipe: on Figure 4.2.2,
the standard star frame and a sky frame, already produced master bad pixel map and master flat field frames,
together with distortion and slitlet distance tables, and the necessary static calibration tables, are all selected
