Report of GLAST Balloon Flight October Annual meeting of Astronomical Society of Japan T. Mizuno and other GLAST Balloon Team

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Presentation transcript:

Report of GLAST Balloon Flight October Annual meeting of Astronomical Society of Japan T. Mizuno and other GLAST Balloon Team

GLAST (Gamma-ray large Area Space Telescope) 20MeV-300GeV Tracker (Si-Strip Detector) Calorimeter (CsI Scintillator) Anti Coincidence Detector (ACD) Wide FOV. (2sr) Large area (~10000cm^2) High spatial resolution 10’ (>10GeV) Number of Detected sources High Sensitivity 4X4=16tower 10^1 10^3 10^ year

Balloon Flight for GLAST eXternal Gamma-ray Target(XGT) Objectives a.Validate the basic LAT design at the single tower level b.Show ability to take data in high background environment c.Recording all or partial particle incidences that can be used as a background event data base. d.Find an efficient data analysis chain TKR (inside) ACD CAL Balloon Flight Engineering Model (BFEM) August 04, Texas

Leak of PV (~0.14atm) Turn off the disk (telemetry data only) during ascent Flight Operation Trigger rate vs. atmospheric depth Telemetry efficiency is low (~2.5%), but BFEM showed ability to take data in high background environment (objective a and b) Total number of events = 10^5(ascent)+10^5(level flight) level flight hours 1000c/s g/cm^2 (km)

Cosmic-ray: proton, electron and positron, gamma, (muon) Comparison between real data and simulation data Development of Cosmic-ray generator (objective c) Trigger rate (data:500Hz, simulation:460Hz) neutral (no ACD hit) event rate (data:50Hz, simulation:65Hz) hit distribution in TKR brush up the simulator (Cosmic-Ray model, detector geometry) Hit Distribution (neutral events) real data c/s CALTop of TKR proton e- gamma e+ We need to adjust gamma-ray flux

Candidates of “gamma-ray event” (objective d) Background filter is developed by Bob Hartman and Taro GSFC Gamma-ray is converted at TKR and absorbed in CAL Gamma-ray from XGT? x z y z

Summary GLAST Balloon experiment was performed on August 04, 2001 at Palestine, Texas We achieved three hours level flight and collected telemetry data Total number of events = 10^5(ascent)+10^5(level flight) BFEM successfully collected data in high background environment Developments of Cosmic-ray model and background filter are under progress