LAT Instrument Operations Center Overview of GLAST Offline software - a fusion of Particle- and AstroPhysics Worlds Richard Dubois, Stanford Linear Accelerator Center for the GLAST Science Analysis Software Group GLAST is a next generation high-energy gamma-ray observatory designed for making observations of celestial gamma-ray sources in the energy band extending from 10 MeV to more than 100 GeV, with launch anticipated in 2007. Its primary scientific objectives are to understand the mechanisms of particle acceleration in AGNs, pulsars and supernova; determine the high-energy behavior of gamma-ray bursts and probe for dark matter. The Science Analysis Software group is responsible for creating the software that will process the data, starting from receipt from the Mission Operations Center through to analyzing photon lists and creating source catalogues. We will provide an overview, describing the planned data flow from space through reconstruction and analysis, including key components of our ground software system. We will cover our HEP-like event reconstruction (uniquely focused on pair-conversion), simulation tools and our interface with the astronomy world which supplies astro-standard tools for high level analysis. We will describe the infrastructure that makes it possible for our small but very dispersed development team (distributed across 9 time zones) to work together, including our code development and build systems, and the data servers that deliver instrument and photon data to our users. Finally we will describe the Data Challenges, beam tests and engineering models that are being used to ensure readiness of the software. Instrument Simulation and Reconstruction CAL Detail Instrument data 3 GeV gamma interaction 3 GeV gamma recon Full geometry in xml with C++ interface G4 discovers instrument from the xml France Germany Italy Japan Sweden USA Package Description Provider Status ACD, CAL, TKR Recon Data reconstruction LAT In use ACD, CAL, TKR Sim Instrument sim GEANT4 Particle transport sim G4 worldwide collaboration xml Parameters World standard Root 4.02.00 C++ object I/O HEP standard Gaudi Code skeleton CERN standard doxygen Code doc tool Visual C++/gnu Development envs World standards CMT Code mgmt tool ViewCvs cvs web viewer cvs File version mgmt Data flow in the Gaudi framework Transient Data Store Ntuple Level 1 Simulation Algorithms Level 0 Reconstruction Algorithms Ntuple Service Pseudo Persistency Algorithms G4 ACD, TKR, CAL Digitization Algorithms Source Generators Root ACD, TKR, CAL, Trigger Raw data Ready for astronomy MC Real Data ~25 software contributors Instant messaging: Example of Using Gaudi Tools    IEnergyCorr* m_lastLayerTool;    sc = toolSvc()->retrieveTool(m_lastLayerToolName, m_lastLayerTool);  m_lastLayerTool->setTrackSlope(slope);  m_lastLayerTool->doEnergyCorr((*it)->getEnergySum(),(*it)); Retrieve tool by name via base class Refer to base class functions. Does not know which concrete tool it is. Concrete classes that customize behaviour Tools id’ed by name in ascii config file (“jobOptions”) Gaim-icq Almost all meetings via Web conferencing: vrvs Code Development gui Clean, config, make, debug Run apps Tabbed ouput buffers cvs operations Package tree Fox/Ruby app Flight Operations GN HEASARC GSFC - DELTA 7920H • White Sands TDRSS SN S & Ku LAT Instrument Operations Center GBM Instrument Operations Center GRB Coordinates Network Telemetry 1 kbps S Alerts Data, Command Loads Schedules Archive Mission Operations Center (MOC) GLAST Science Support Center GLAST Spacecraft Large Area Telescope & GBM GPS GLAST MISSION ELEMENTS TLM: S-band @ 1,2,4,8 kbps Science data @ 40 Mbs (13 GB/day average) CMD: S-band @ .25, 4 kbps Internet 2 40 Mbs R.Dubois Java Tied in to Release Manager builds database Provide self-contained scripts to run executables sans CMT Multiple views 3D controls Graphics tree Graphics metadata: HepRep Event control GLAST plugin GlastRelease config Fox/Ruby/C++ app Collaboration Support Integration Data One code system for all uses: Simulations, Engineering Models, Beam Tests, Flight Operations Code Installer The Simulated DC1 Sky Extragalactic diffuse Galactic diffuse EGRET 3EG Fiddling 3C273/279 Our Sky Event Visualization Automated Code Builds Past release Release in progress Future release Display created from database query Performing builds for Science Tools also Build status Unit test status V&V: System tests of software builds Comparison of current to previous release. Three Data Challenges Web tag collector All builds done in batch windows linux Multiple packages being tracked Run by Release Manager auto triggered some 800 histos per code build shapes compared to standards all tracked in database See N.Golpayegani poster Data Challenges Ground software is amalgam of HEP instrument software and Astro FTOOLS Adopt HEP’s “Data Challenges” to create a series of end-to-end studies: create a progression of ever more demanding studies DC1. Modest goals. Contains most essential features of a data challenge. 1 simulated day all-sky survey simulation find GRBs recognize simple hardware problem(s) a few physics surprises Exercise all the components DC2, start beginning of CY06. More ambitious goals. Encourage further development, based on lessons from DC1. One simulated month. DC3, in CY07. Support for flight science production. DC Components Focal point for many threads Orbit, rocking, celestial coordinates, pointing history Plausible model of the sky Background rejection and event selection Instrument Response Functions Data formats for input to high level tools First look at major science tools – Likelihood, Observation Simulator Generation of datasets Populate and exercise data servers at SSC & LAT Code distribution on windows and linux Involve new users from across the collaboration Teamwork! Data Analysis for High Energy Astronomy Framework driven by Desire for uniformity between missions Guest observer support (HEASARC) Aggregate nature of the data: events are (almost) never analyzed individually Standardized software and data formats FITS files for images and tabular data FTOOLs for examining and manipulating contents Can be mission-specific User interfaces – “parameter interface layer”, ballistic operation Often scripted (Tcl, Perl), some GUI use High level analysis applications: Xspec (from Xanadu suite), Sherpa, ISIS (from CIAO), etc. Unix-based tradition; GLAST pushing for Windows support