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First ideas about Svom alert distribution

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First ideas about Svom alert distribution : SvomNetJean-Paul Le FèvreSVOM Ground project managerCEA/irfuApril 2009Context of the SVOM mission•SVOM : a French-Chinese space mission•Launch likely in 2014•By an Italian rocket Vega from Kourou in French Guyana•Payload on a mini-satellite developped by Thales•Purchased by China2The French Science Center•Purchased by China•Altitude of the orbit : 630 km, inclination of 30°•Duration of the mission 3 (+3) yearsThe members involved in the mission•Agreement between French & Chinese governments•A Memorandum Of Understanding was signed•In France CNES – the space agency – manages the project•In China Academy of Sciences is in charge•Equipments are developed by different laboratories3The French Science Center•Equipments are developed by different laboratories•IRFU has the responsibility of the gamma telescope ECLAIRs•And of part of the ground segment : The French Science CenterSchedule as of April 209200920102011 2012 2013 2014 2015 2016Specs Implementation Tests ExploitationLe FSC should be ready by end of 20124The French Science CenterLaunch forseen in 2014The FSC at the heart of SVOMThe FSC at the heart of SVOMThe FSC at the heart of SVOMThe FSC at the heart of SVOM5The French Science CenterThe French Science Center•The Commissariat à l’énergie atomiqueCommissariat à l’énergie atomiqueCommissariat à l’énergie atomiqueCommissariat à l’énergie atomique(CEA) is in charge of the FSC development•The FSC will be settled at Saclay on the outskirts of Paris•It is one of the main CEA centers, located on the plateau de Saclay at about 20 km from Paris downtown6The French Science CenterThe FSC at the heart of the SVOM worldFSCFSCFSCFSCVHFVHFVHFVHFVHFVHFVHFVHFVHFVHFVHFVHFCMCCMCCMCCMCEMGEMGEMGEMGEMGEMGEMGEMGFranceFranceFranceFranceChineChineChineChine7The French Science CenterGFTGFTGFTGFTSvomNetSvomNetSvomNetSvomNetMondeMondeMondeMondeFSC architecture, main interfacesChinese Mission CenterChinese Mission CenterChinese Mission CenterChinese Mission CenterEquipmentEquipmentEquipmentEquipmentManagementManagementManagementManagementGroupsGroupsGroupsGroupsVHFVHFVHFVHFAlert MessagingMonitoringData, TC, HK8The French Science CenterFrench Science CenterFrench Science CenterFrench Science CenterFrench Science CenterChinese Science CenterChinese Science CenterChinese Science CenterChinese Science CenterFFFF----GFTGFTGFTGFTVHFVHFVHFVHFVOEvent networkVOEvent networkVOEvent networkVOEvent networkUsers, worldUsers, worldUsers, worldUsers, worldScience dataFSC main interfacesFSC main interfacesFSC main interfacesFSC main interfacesData, TC, HKRDBMSFrench Science CenterFrench Science CenterFrench Science CenterFrench Science CenterControllerhttpVHFVHFVHFftpmsghttpftpmsghttpRest of the worldRest of the worldRest of the worldRest of the world9The French Science CenterChinese Chinese Chinese Chinese Mission & ScienceMission & ScienceMission & ScienceMission & ScienceCentersCentersCentersCentersmsgftpFTP serverHTTP serverXMPP serverEquipmentManagementGrouphttpftp msgEquipmentManagementGrouphttpmsgGFTmsghttpftpAlert distribution networkVHFDispatcherDispatcherVHFSynchronous modeAsynchronous modeFSCFSCFSCFSCCSCT0T0T0T0+15 s+15 s+15 s+15 s+35 s+35 s+35 s+35 s+40 s+40 s+40 s+40 s10The French Science CenterGFTGFTGWACLargeTelescopesVOeventNetserverVOeventNetserverGCNLabsSvomNet+60 s+60 s+60 s+60 s+ 5 mn+ 5 mn+ 5 mn+ 5 mn+mn , hr+mn , hr+mn , hr+mn , hrGCN vs VOEventGCN vs VOEventGCN vs VOEventGCN vs VOEvent•GCN : very successful, broadly used, appreciated by physicists•But :– managed by NASA– natural language– gamma ray burst only•VOEvent is what SVOM needsttddtXMLf ttd11The French Science Center–structured data, XML formatted– follow up oriented– designed for any type of astronomical transient events– IVOA recommendation– gateway between GCN and VOEvent availableVOEvent transportVOEvent transportVOEvent transportVOEvent transport•Different protocols may used to broadcast VOEvents•XMPP (Jabber) sounds to suit our needs•SOAP is used by eStar•VTCP (vanilla TCP) is a plain solution•RSS may also be investigated•SMTP : why not ?12The French Science Center•They work with XML formatted packets•They are widely used•They are standardized, RFC are published•A lot of tools handling these protocols is available•XMPP and its extensions provide functionalities fulfilling most of the SVOM needsWhat we plan to do in the coming monthsWhat we plan to do in the coming monthsWhat we plan to do in the coming monthsWhat we plan to do in the coming months•Apply the VOEvent schema to the Svom events•Insert SVOM alert data into a VOEvent XML packet•Implement an experimental distribution system•One based on VTCP in the spirit of the KISS philosophy•A more sophisticated one based on XMPP :13The French Science CenterA more sophisticated one based on XMPP :– To evaluate the available servers– To see how the protocol is handled– To start working on the client side•Then draw conclusions for SvomNetSvomNet collaborationSvomNet collaborationSvomNet collaborationSvomNet collaborationFSCFSCFSCFSC CSCCSCCSCCSCS/CS/CS/CS/CFGFTFGFTFGFTFGFTGWACGWACGWACGWACCGFTCGFTCGFTCGFTSvomNetSvomNetSvomNetSvomNet14The French Science CenterThen …Then …Then …Then …•Keep on working on SvomNet :– Protocol : push vs pull approach ?– Alert data sharing between France and China– Relations with other nets : VOEventNet, eStar, etc.•Start working on A n A :–Authentication : who’swho?15The French Science CenterAuthentication : who s who ?– Authorization : who does what ?•Web site (in construction) : http//www.svom.fr•Email :


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