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Omar Tibolla. ISAPP. Belgirate (Italy) 30 June - 9 July 2005

Omar Tibolla. ISAPP. Belgirate (Italy) 30 June - 9 July 2005. Gamma-ray Large Area Space Telescope -France -Germany -Italy -Japan -Sweden -USA Energy Range 10 keV-300 GeV. GLAST : - An imaging gamma-ray telescope ( LAT )

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Omar Tibolla. ISAPP. Belgirate (Italy) 30 June - 9 July 2005

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  1. Omar Tibolla. ISAPP. Belgirate (Italy) 30 June - 9 July 2005 Gamma-ray Large Area Space Telescope -France -Germany -Italy -Japan -Sweden -USA Energy Range 10 keV-300 GeV. GLAST : - An imaging gamma-ray telescope (LAT) - A second instrument for the study of Gamma Ray Bursts (GBM).

  2. Omar Tibolla. ISAPP. Belgirate (Italy) 30 June - 9 July 2005 The main instrument of GLAST is the Large Area Telescope (LAT): a pair conversion telescope: Anticoincidence Shield (ACD) made of plastic scintillator (Bicron-408) sensitive to charged particles; ACD is segmented to avoid self veto from Calorimeter backsplash and also for micrometeorites. ACD contains 16 towers and each tower is divided in two parts: -the TRACKER (TKR): 18 layers in each tower -Tungsten converters (1.08 χ0 : 78% prob) -2 orthogonal SSD planes of silicon microstrip sensors for detecting the electromagnetic shower -a CALORIMETER (CAL) of CsI crystals dopped by Tl; so the energy deposited by the EM shower is converted in light signal. CAL is characterized by fast decaying fluorescent light (~ns) and a long decaying afterglow (~ms). TRACKER CALORIMETER ANTICOINCIDENCE SHIELD

  3. Omar Tibolla. ISAPP. Belgirate (Italy) 30 June - 9 July 2005 LAT Specifications and Performance Compared with EGRET

  4. Omar Tibolla. ISAPP. Belgirate (Italy) 30 June - 9 July 2005 The Glast Burst Monitor (GBM) will include two sets of detectors: -12 sodium iodide (NaI) scintillators -2 cylindrical bismuth germanate (BGO) scintillators The NaI detectors are sensitive in the lower end of the energy range, from a few keV to about 1 MeV and provide burst triggers and locations. The BGO detectors cover the energy range ~150 keV to ~ 30 MeV, providing a good overlap with the NaI at the lower end and with the LAT at the higher end. Schematic layout of the 12 NaI and two BGO detectors on the GLAST spacecraft

  5. Omar Tibolla. ISAPP. Belgirate (Italy) 30 June - 9 July 2005 GBM Specifications and Performance Compared with BATSE

  6. Omar Tibolla. ISAPP. Belgirate (Italy) 30 June - 9 July 2005 GAMMA-RAYBURSTS PULSARS EXTRAGALACTICBACKGROUND LIGHT Scientific purposes And other extremely important features are the COMPLEMENTARITY WITH GROUND-BASED GAMMA-RAY TELESCOPES and that GLAST will study the Universe in UNEXPLORED REGIONS OF EM SPECTRUM. COSMIC RAYS AND INTERSTELLAR EMISSION NEW PARTICLE PHYSICS UNIDENTIFIED EGRET SOURCES SOLAR FLARES AGN/BLAZARS

  7. Omar Tibolla. ISAPP. Belgirate (Italy) 30 June - 9 July 2005 Background rejection with Classification Trees using R . -Signal file (ag-v3r3p7-merituple-prune20031218-fulltup.root) 722594 γ (power law, isotropic 4) -27 BKG files (ntuple_prune*.root)5551326events : p, e-, e + , albedo γ A day of “real” data (part of Data Challenge 1). Before bkg rejection with R CT was made in a single step:0signal1bkg I tried to do it in 2 steps: 1º: separate g from charged particles. 2º: separate with the same method signal g and albedo g 0 charged particle1 γ 2 γ sign 3 γ albedo

  8. Omar Tibolla. ISAPP. Belgirate (Italy) 30 June - 9 July 2005 Conclusions -Big improvements using matrix of costs, expecially in high energy bins.-Problems with second steps.

  9. Omar Tibolla. ISAPP. Belgirate (Italy) 30 June - 9 July 2005 Conclusions (2)

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