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Status Update on GLAST Burst Monitor (GBM) Development and Flight Readiness

The GLAST Burst Monitor (GBM) project is progressing with several key developments. The Flight Data Processing Unit was delivered to MSFC on April 1, and initial flight detectors arrived recently. Flight Software Build 1 is complete, with Build 2 nearing finalization. Issues such as EMI violations and discrepancies in detector efficiency are under investigation. Critical milestones include upcoming testing and the delivery of all detectors by September 26, leading to spacecraft integration scheduled for March 16, 2006.

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Status Update on GLAST Burst Monitor (GBM) Development and Flight Readiness

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  1. GLAST Burst Monitor (GBM) Chip Meegan NASA/MSFC

  2. Status • The Flight Data Processing Unit was delivered to MSFC on April 1. • The first flight detectors (spares) were delivered from MPE to MSFC last week. • Flight Software Build 1 complete; Build 2 (final build) several weeks from completion. • Shock test failure is resolved – shock absorbing sleeves will be added to mounting

  3. GBM Hardware Deliveries BGO Detector Data Processing Unit NaI Detector Flight-like cable harness

  4. Issues • EMI violations at receiver frequencies; we think we have a fix and will test next week. • Uncertainty in response at low energy.

  5. Low Energy Sensitivity • Level II requirement for energy range minimum of 10 keV. • Level III requirement to have 100 cm2 effective area at 14 keV (80% efficiency). • Silicone pad cushion is main source of absorption. • Calculations indicated effective area of ~75 cm2. • Absorption measurements of entrance window indicated effective area of ~100 cm2. • Absolute measurement of detector efficiency indicates effective area of ~50 cm2. • Discrepancy under investigation.

  6. Schedule • Interface testing of EQMs and DPU this week. • Flight Power Supply Box completed by end of this month; delivered to MSFC August 10. • All remaining detectors delivered by September 26 (probably earlier). • Pre-environmental review at MSFC November 21. • Delivery to spacecraft integration March 16, 2006. • Critical path is flight software (to complete testing before environmental testing at MSFC).

  7. BWG Telecon on Solar Flares • Held May 19 to discuss repointing to solar flares • BWG + Jim Ryan, Gotfried Kanbach, Gerry Share • Points raised: • Need to simulate instrument response to SFs. • GBM trigger classification reliability. • Include flare in Data Challenge 2. • Different repoint algorithm for SFs vs. GRBs. • LAT Solar System Science Team is focal point for SF issues. • May get ToO requests for several day observations.

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