Gamma-ray Large Area Space Telescope
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Gamma-ray Large Area Space Telescope. The Gamma-ray Large Area Space Telescope Mission key facts, status Expected first light results INFN, Commission Scientifica Nazionale II Giornata di aggiornamento sulla Fisica Astroparticellare Laboratori Nazionali del Gran Sasso, 2 Aprile 2008.

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The gamma ray large area space telescope mission key facts status expected first light results

Gamma-ray Large Area Space Telescope

The Gamma-ray Large Area Space Telescope

Mission key facts, status

Expected first light results

INFN, Commission Scientifica Nazionale II

Giornata di aggiornamento sulla Fisica Astroparticellare

Laboratori Nazionali del Gran Sasso, 2 Aprile 2008


The glast gamma ray observatory key facts

The GLAST gamma-ray observatory – Key Facts

  • Launch

    • Date

      • 16 May 2008

  • Location

    • Kennedy Space Flight Center

  • Vehicle

    • Delta II – 2920-10H

  • Orbit

    • Altitude

      • 575 Km

  • Inclination

    • 28.5 degrees

  • Period

    • 95 minutes

  • Instruments on board

    • Large Area Telescope (LAT)

      • 20MeV – >300GeV

  • Gamma Burst Monitor

    • 10KeV – 30MeV

  • Observing strategy

    • Survey + Pointing (Autonomous Repoint Request, Target of Opportunities)

  • GLAST at NASA-KSFC for final preparation for launch on may 16 2008

    International multi-agency mission


    The lat instrument how we built it

    • Tracker/Converter (TKR):

    • Silicon strip detectors (single sided, each layer is rotated by 90 degrees with respect to the previous one)

    • W conversion foils

    • ~80 m2 of silicon

    • ~106 electronics chans

    • fully digital electronics

    • High precision tracking, small dead time

    g

    • Anti-Coincidence (ACD):

    • Segmented (89 tiles)

    • Self-veto @ high energy limited

    • 0.9997 detection efficiency (overall)

    • Calorimeter (CAL):

    • 1536 CsI crystals

    • Analog 4 range readout

    • 8.5 X0

    • Hodoscopic

    • Shower profile reconstruction (leakage correction)

    e+

    e-

    The LAT instrument: how we built it

    • Overall modular design:

    • 4x4 array of identical towers - each one including a Tracker, a Calorimeter and an Electronics Module.

    • Surrounded by an Anti-Coincidence shield (not shown in the picture).

    Page Number


    Lat performance

    LAT Performance

    http://www-glast.slac.stanford.edu/software/IS/glast_lat_performance.htm

    Energy dispersion

    relative Aeff vs g angle at 10GeV

    68% containment of the PSF

    update before pre-launch package

    Energy dispersion vs g angle

    on-axis effective area

    PSF vs g angle at 10GeV


    First light image vs egret

    LAT Intensity MAP

    PSF better, somewhat fewer counts

    thousands new AGN detections expected in years of operation

    ‘True color’ counts map (red: 100-400 MeV, green: 400-1600 MeV, blue: >1600 MeV)

    First Light Image vs. EGRET

    EGRET >300 MeV intensity map, no smoothing

    LAT Simulation >300 MeV

    4days survey (160k g-rays);


    First light results and validation from the vela

    E>100 MeV – PSF < 3.3o

    E>1 GeV – PSF < 0.6o

    First Light Results and validation from the Vela

    7 days pointed - Light curve for absolute timing validation

    Large Effective Area many photons

    >8kcm2 flat above 1GeV

    >3kcm2 at 100 MeV fast rising


    Backup

    BACKUP


    The gamma ray large area space telescope mission key facts status expected first light results

    g

    GRID

    Mechanical

    backbone

    e-

    e+

    Electronics & Flying Software

    Data Acquisition System

    Overview of the Large Area Telescope

    Segmented Anticoincidence Detector (ACD)

    89 plastic scintillator tiles

    surrounding the TKR towers

    Reject background of charged cosmic rays Removes self-veto effects at high energy

    Precision Si-strip Tracker (TKR) 18 XY tracking planes

    Single-sided silicon strip detectors 228 mm pitch, 8.8 105 channels

    Measure the photon direction

    LAT:

    4 x 4 modular array

    3000 kg, 650 W

    Hodoscopic CsI Calorimeter(CAL)

    Array of 1536 CsI(Tl) crystals in 8 layers

    6.1 104 channels

    Measure the photon energy, image the shower

    Page Number


    First light all sky image

    First Light All-Sky Image

    • Simulation of 4 days of survey

    572k g-rays (cf ~1.4M for EGRET)

    ‘True color’ counts map (red: 100-400 MeV, green: 400-1600 MeV, blue: >1600 MeV)


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