Jean-Paul Le Fèvre CEA Saclay, Irfu France

1. Jean-Paul Le Fèvre CEA Saclay, Irfu France The Svom VHF network Svom ( Space-based multi-band astronomical Variable Objects Monitor ) is a Sino-French mission dedicated to the detection, localization and study of GRB (Gamma Ray Bursts) and other high-energy transient phenomena (X-ray bursts, soft gamma repeaters, AGN (Active Galactic Nuclei), novae...). The observations will follow three main stages: 1. Detecting the gamma-ray bursts using space-based equipment capable of providing their position in quasi real time with an accuracy of a few arc minutes. 2. Observing the region of the burst as rapidly as possible using small robot-controlled telescopes to de­tect optical afterglow in the visible and near-infrared wavelengths and to provide its position with an accu­racy of one arc second. 3. Detecting the spectrum of the optical afterglow in the visible and near-infrared wavelengths as rapidly as possible using the largest Earth-based telescopes. To achieve these scientific objectives, the measurements strategy followed for the Svom mission makes the best possible combined use of onboard and ground observations, requiring quasi real time contact with the satellite. A collection of ground stations, known as the VHF alert network, receives the information concerning onboard detection and location of the burst and sends it automatically to the FSC (French Science Centre) in the CEA at Saclay. The data are processed by an automaton which alerts the ground-based instruments of the Svom sys­tem as well as the international community. Data about the location of a burst must be conveyed to users in less than a minute in more than 85% of cases. This scientific requirement implies that the satellite must be almost permanently visible to at least one station. Considering the satellite’s altitude (600 km) and orbital inclination of 30°relative to the equator, the VHF alert network requires about 40 stations. The VHF network The Svom mission VHF receivers should be installed inside the strip ±30°latitude. About 40 locations should be found. We need help ! If you know a place where it will be possible to set up a VHF station go visit the Svom registration web site. We are seeking organizations, teams or people willing to participate to our adventure. The registration web site svomtest.svom.fra.k.agoo.gl/g8Ab0n The web app architecture A 100% javascript web application d The client side The server side db.sites.insert({ id: id(), name: ‘Saclay’, … }); In the browser Express framework for NodeJs Bootstrap Client-sideframework Model View Controller var app = express(); var http = require(‘http’) … app.use(app.router);app.use(express.static( path.join(__dirname, 'client'))); … http.createServer(app) .listen(app.get('port'), function(){    logger.log('info',               'Svom on port %d',               app.get('port'));}); db.users.insert({ id: id(), login: ‘nabila’, … }); mongoose var siteSchema = new app.mongoose.Schema({ name: {type: String, required: true, unique: true}, … }); Toolkit, css, html5 widgets Bootswatch Themes mocha Unit testing the server Contact: jean-paul.lefevre@cea.fr Adass XXIII September 2013, Waikoloa, Hawaii, USA