French Science Ground Segment - FSGS

Welcome to the Svom French Science Ground Segment documentation portal. This page is the main gateway to all FSGS-related documentation.

Important

This page is still under construction, some parts may be unavailable, incomplete and/or plainly wrong

The Svom French Science Ground Segment (FSGS) is devoted to the management of satellite data and scientific products which are of interest for the French scientists community.

Context

An overview of the French Mission Ground Segment (FMGS) is displayed on Fig. 1. Within the FMGS, most science activities are hosted at the French Science Center (FSC), whereas the activities related to the instruments operation and calibration are managed at Instrument Centers (EIC, MIC and GIC). The group constituted by the FSC and the ICs is called the French Science Ground Segment (FSGS).

Fig. 1 Overview of the Svom French Mission Ground Segment

Main functionalities

The FSGS encompasses all software components needed for data processing by the Svom experiment. The operational components are described below:

• VHF data management: these components are dedicated to raw data reception from ground stations and basic processing (de-commutation from binary formats, metadata extraction, classification,…).

• Alert data management: these components are dedicated to automatic processing of alerts. They have well defined time constraint that need to be guaranteed (see SRD, MOCD and SR1).

• X-Band data management: these components are dedicated to raw data reception from X/S bands coming from Svom centers connected to FSC.

• External Informations management: these components are dedicated to gathering informations coming from sources outside the Svom mission (meteo, star catalogues,…) which are needed in different step of the data processing.

• General services and modules: these are services needed by many components running at FSC, and providing a basic infrastructure for configuration needs, storage of calibration data, monitoring and logging. Users and authorization management can be considered part of these set of services.

• Instrument data processing: these components are dedicated to the processing of instrument data for later use in science analysis or for the control and calibration of the ECLAIRs and MXT instruments

• Science data processing: these components include all analysis tasks related to the various Svom observation programs

Organization

The French Scientific Ground Segment (FSGS) is the entity that brings together the 4 French centers participating in the operation of the French ground segment:

• The French Science Center (FSC) is hosted in the CC-IN2P3 cloud and under CEA/Irfu responsibility

• The ECLAIRs Instrument Center (EIC) is hosted and operated at IRAP (Toulouse). The part of the EIC that is responsible for the ECLAIRs trigger optimization will be hosted within the FSC infrastructure.

• The MXT Instrument Center (MIC) is hosted in the CC-IN2P3 cloud and operated by the CEA/Irfu (Saclay)

• The French Ground Follow-up Telescope Instrument Center (GIC) is operated from CPPM (Marseille) with a functional extension in San Pedro Martir, Mexico, near the F-GFT telescope.

The project management entrusted to the CEA/Irfu by the CNES for the realization of the FSGS implies a technical coordination of all the associated French laboratories:

APC - Laboratoire d’AstroParticules et Cosmologie, Paris

CPPM - Centre de Physique des Particules de Marseille

GEPI - Galaxies, Étoiles, Physique et Instrumentation, Meudon

IAP - Institut d’Astrophysique de Paris

IJCLab - Laboratoire de physique des deux infinis Irène Joliot-Curie, Orsay

Irap - Institut de Recherche en Astrophysique et Planétologie, Toulouse

LAM - Laboratoire d’Astrophysique de Marseille

LUPM - Laboratoire Univers et Particules de Montpellier

ObAS - Observatoire Astronomique de Strasbourg

Some Chinese teams also provide software modules that are integrated into the FSC infrastructure.

The CEA/Irfu is responsible for the integration and management of the FSGS as a whole, and for the integration of the software modules which are hosted in the FSC computing infrastructure in particular. It ensures the coordination between all of the associated laboratories.

Within this framework, it is responsible for the following elements and activities:

• Managerial coordination, with definition of the FSGS development plan and its regular updating

• System animation

• Interface management, including quality follow-up, integration and validation of modules, coordination of operational readiness