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GLAST Data & Software Release plans + Science Support Center Services

GLAST Data & Software Release plans + Science Support Center Services. C. Shrader, GLAST SSC GSFC, Code 661. Overview: GSSC Services. Develop and maintain public data archive as part of HEASARC Distribute & support GLAST analysis software Various aspects of proposal support

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GLAST Data & Software Release plans + Science Support Center Services

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  1. GLAST Data & SoftwareRelease plans + Science Support Center Services C. Shrader, GLAST SSC GSFC, Code 661 Getting Involved with GLAST Workshop, CFA, 06/21/2007 - C. Shrader, NASA/GSFC

  2. Overview: GSSC Services • Develop and maintain public data archive as part of HEASARC • Distribute & support GLAST analysis software • Various aspects of proposal support • Web services including software documentation, mission new & information • Help desk, phone support • ToO and timeline support • Guidance from project, NASA HQ and GLAST Users Group Getting Involved with GLAST Workshop, CFA, 06/21/2007 - C. Shrader, NASA/GSFC

  3. Data Analysis Support • GSSC has scientists at GSFC and both instrument team sites • General “help desk” facility supported via GSSC web site • GSSC plans to conduct data analysis workshops and demonstrations • Schedules, specific venues tbd (e.g. future AAS, HEAD) • Visit the GSSC web site: <http://glast.gsfc.nasa.gov/ssc/> Getting Involved with GLAST Workshop, CFA, 06/21/2007 - C. Shrader, NASA/GSFC

  4. Proposal Support • Separate presentation • D. Band • Cycle-1 materials are online • Help desk, FAQs DB now active • Proposals due September 7, 2007 • Peer review Dec. 2007 Getting Involved with GLAST Workshop, CFA, 06/21/2007 - C. Shrader, NASA/GSFC

  5. GLAST Data: A Few Key Points • GLAST is primarily operated in scanning mode • Not traditional telescope “Observations” • All sources are observed at least once every two orbits; typical ~1/6 duty cycle • All data are time ordered • Survey data • Pointed observations (including AR’s, ToO’s) • Cannot isolate LAT events for single source analysis • PSF ~3.5º @ E=100 MeV, ~0.15º at E>10 GeV • Analysis of spatial region required Getting Involved with GLAST Workshop, CFA, 06/21/2007 - C. Shrader, NASA/GSFC

  6. GLAST Data (cont.) • Exposure time tabulation is trickier than for typical astronomical telescope • SW handles this, but cognizance is urged • All data stored in sky regions; new data is added to the region as it is received (~hrs) • GSSC data server will “carve out” data from the full-sky DB based user-defined cuts:. • Will accept a spatial region • Allows for selection based on time • Energy cuts are also supported • Additional cuts downstream w/science tools Getting Involved with GLAST Workshop, CFA, 06/21/2007 - C. Shrader, NASA/GSFC

  7. GLAST SAE • GLAST “Standard Analysis Environment” (SAE); collaborative effort, GSSC and instrument teams • Will be distributed as an “FTOOLS” package • Adherence to broader HEASARC standards • “Atomic” executables, FITS I/o, IRAF style param files • Scriptable, easy GUI implementation • GBM related tools released prior to Cycle 1 • Full set of LAT tools prior to Cycle 2 • LAT analysis has unique complexities associated w/PSF, backgrounds, scanning • Usability and viability demonstrated to 1st order • Data challenges (GLAST collaboration) • Beta testing (GLAST Users Committee) Getting Involved with GLAST Workshop, CFA, 06/21/2007 - C. Shrader, NASA/GSFC

  8. GLAST SAE • Overview of capabilities • Maximum likelihood tool—spatial-spectral analysis of region (source detection, flux) • Includes background models • Pulsars—period analysis, blind searches • Includes ephemerides DB • GRBs—temporal cuts, binned-spectral analysis using XSPEC • Tools and documentation will be released through GSSC website • release schedule driven by launch & data availability Getting Involved with GLAST Workshop, CFA, 06/21/2007 - C. Shrader, NASA/GSFC

  9. GLAST SAE (cont.) • Existing tools used when possible and appropriate • ds9, fv, Root for visualization • HEADAS (Ftools) libraries and basic utilities • XSPEC for spectral model fitting (w/caveats) • Stable support for standard tools & backward compatibility as warranted • File formats conform to HEASARC standards • Major analysis elements have been verified with existing tools & simulated data • Supported platforms • Development is simultaneous on Linux and Windows • All HEADAS supported platforms will be supported Getting Involved with GLAST Workshop, CFA, 06/21/2007 - C. Shrader, NASA/GSFC

  10. GLAST SAE(cont.) • A limited set of science tools are available for the first proposal period • GBM analysis is supported by “gtbin” + Ftools & XSPEC • A full release is scheduled for support of Cycle 2 • 2nd proposal period and analysis of the 1st year data • Plans for pre-release beta testing are under discussion with GUG & in-house Getting Involved with GLAST Workshop, CFA, 06/21/2007 - C. Shrader, NASA/GSFC

  11. SAE Release Schedule • Distributed via GSSC website or w/HEADAS distribution • GBM tools: Launch + 0 months • LAT tools: Launch + 8 months • Documentation • Full set accompanies SW release • GLAST Technical Handbook: online now • Multiple levels: • Detailed description • Individual tool descriptions (like Ftool help pages) • Analysis threads Getting Involved with GLAST Workshop, CFA, 06/21/2007 - C. Shrader, NASA/GSFC

  12. Basic Data Policy • Mission cycle 1: limited LAT data release • Selected high-level products • Information on transient discoveries • Full GBM data release • Mission cycle 2 and beyond: All Science Data Are Public As Soon As Processed • Automated pipeline, SLAC GSSC • <2-day latency requirement, but expect ~hrs Getting Involved with GLAST Workshop, CFA, 06/21/2007 - C. Shrader, NASA/GSFC

  13. GLAST Data Release Policy Cycle 1 • LAT instrument team is responsible for: • Calibrations and analysis methods need to be verified • Preparation of source list, point source catalog • LAT high-level data product release • Fluxes, spectra and lightcurves for ~25 sources • Transients exceeding Fth~2x10-6 cm-2s-1 • <http://glast.gsfc.nasa.gov/ssc/data/policy/LAT_Monitored_Sources.html> • Full GBM release • Summary GBM and LAT burst information: locations, spectra, durations, peak fluxes • Preliminary LAT source list @ 6 months • Auxiliary data (details under discussion) Getting Involved with GLAST Workshop, CFA, 06/21/2007 - C. Shrader, NASA/GSFC

  14. GLAST Data Release Policy Cycle-2 and Beyond • Prompt release of all level-1 data products! • LAT events—energy, time, and direction of events classified as photons • FITS event list, following HEASARC conventions • Also, accompanying FITS DB of spacecraft info • GBM events—energy and time of events from burst • All auxiliary data • e.g. “Exposure Cubes” can in some cases be pre-generated saving end-user CPU time Getting Involved with GLAST Workshop, CFA, 06/21/2007 - C. Shrader, NASA/GSFC

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