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The GLAST Burst Monitor

The GLAST Burst Monitor. Chip Meegan NASA/MSFC. GBM Mission Objective.

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The GLAST Burst Monitor

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  1. The GLAST Burst Monitor Chip Meegan NASA/MSFC

  2. GBM Mission Objective • The goal of the GLAST Burst Monitor (GBM) is to enhance the Science return of the Gamma Ray Large Area Space Telescope (GLAST) mission in the study of gamma-ray bursts. GBM will measure the spectra of bursts over a wide energy band and with high temporal resolution. The GBM will also detect bursts over a large solid angle. It will determine the directions to the bursts, to allow optional repointing of the main instrument.

  3. GBM Collaboration National Space Science & Technology Center University of Alabama in Huntsville NASA Marshall Space Flight Center Max-Planck-Institut für extraterrestrische Physik Michael Briggs William Paciesas Robert Preece Narayana Bhat Charles Meegan (PI) Gerald Fishman Chryssa Kouveliotou Robert Wilson Giselher Lichti (Co-PI) Andreas von Keinlin Volker Schönfelder Roland Diehl Jochen Greiner On-board processing, flight software, systems engineering, analysis software, and management Detectors, power supplies, calibration, and analysis software

  4. Instrument Functional Diagram HKG sensors 1 of 12 Signal NaI PMT /12 Immediate trigger signal Data Processing Unit (DPU) to LAT /12 HSSDB Power Power Box (HV & LV) CTDB PPS Command & Response Spacecraft Interface Reset /2 Power 1 of 2 BGO Signal PMT PMT Signal

  5. GBM Component Placement

  6. GBM Requirements and Capabilities

  7. GRB Spectral Performance (GBM+LAT) Simulated GBM and LAT response to time-integrated flux from bright GRB 940217

  8. Data Types • At All Times: • CTIME: 8 energy channels – 256 ms – all detectors • CSPEC: 128 energy channels – 8.192 s – all detectors • During Bursts: • TTE: Time tagged events, 128 channels • Pre-trigger: 500,000 events • Post-trigger: ~300s, selected detectors • Alert Messages: real-time location, peak flux, fluence

  9. Engineering Hardware NaI Detector Data Processing Unit

  10. Science Investigations • GBM Team Proposal: • Time-resolved Spectroscopy of GRBs • Rapid Burst Locations • Burst Catalog, inc. Spectroscopy Catalog • Other Possibilities (GI Program) • Solar Flares • SGRs • Occultation Sky Survey • Long Period X-Ray Pulsars

  11. Expected Detector Performance

  12. GBM Burst Alerts GBM S/C LAT Trigger < 5ms Direct link Quick Test? Classification, Location, Hardness, Initial Flux < 2 s Begin R/T downlink Mode Change ? Flux, Fluence, Hardness (Running Updates) Continue R/T, 5 - 10 min. Parameters Science Repoint Candidate 2 to ~60 s Information packet GBM Repoint request LAT S/C Repoint Decision GBM/LAT S/C

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