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GLAST Burst Monitor (GBM) Chip Meegan NASA/MSFC Status Update

Keep up with the latest developments in GLAST Burst Monitor (GBM) Chip Meegan at NASA/MSFC. Get updates on hardware deliveries, flight software progress, issues, schedule, and discussions on solar flares.

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GLAST Burst Monitor (GBM) Chip Meegan NASA/MSFC Status Update

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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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