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GRB Spectrum simulating a transient source

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Primary and secondary Galactic Cosmic Rays: protons and electrons. Albedo gammas ... The satellite is illuminated in the correct way ... – PowerPoint PPT presentation

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Title: GRB Spectrum simulating a transient source


1
GRB Spectrumsimulating a transient source
  • Status Report
  • Nicola Omodei
  • Johann Cohen-Tanugi

2
The activities
  • FluxSvc
  • General Design
  • GRBSpectrum
  • GRBTest
  • Some results (presented as picture gallery)
  • Scientific Group Activities

3
Flux Svc
  • Selection of different particle for the
    simulation
  • Different Sources
  • Primary and secondary Galactic Cosmic Rays
    protons and electrons
  • Albedo gammas
  • Gammas for testing resolution
  • Galactic gamma point sources
  • Galactic diffuse sources
  • Transient sources-gt GRB Spectrum
  • The satellite is illuminated in the correct way
  • Given the position of the source FluxSvc computes
    the incident photons angle depending on the
    orbit of GLAST.

4
GRB simulation
  • Weve started from a plausible astrophysical
    source model (Fireball Model) that describes the
    temporal behavior of a typical Gamma Ray Burst
  • Rapid variable signal (ms)
  • Non thermal emission (Synchrotron Inverse
    Compton Scattering)
  • XML description not yet available
  • Dictionary of spectra implemented for look up
  • Many parameters -gt might be clumsy
  • Chance to have a real simulator (also for the
    sources)
  • Written Entirely in C

5
How does the model work ?
6
What does GRBSim do ?
7
Light Curves
Short Bursts Long Bursts
Complex Shapes
The harder peaks are shorter and peak before
8
Contour Plot
lt- Synchrotron
Time (sec)
Log(energy)
Time (sec)
Synchrotron IC -gt
Log(energy)
9
Spectrum
Different Emission processes are included. The
Shape of the spectrum will be a key study to
understand the nature of this phenomenon.
10
Waves, Mountains ? No GRBs !!
11
Root Plot
It plots a certain number of events Extracted
from a Flux of the source library.
An already existing test executable is capable to
use GRB
12
To do list about the SW
  • Clean Up the code (as always)
  • Include different HE emission processes ( ??
    annihilation)
  • Study the surrounding Media
  • Precursor plerionic activity in the SN model of
    GRB External Compton
  • (Inoue, Guetta Pacini)
  • Documentation (Doxigenation !!!)
  • Extensive use of ROOT !!
  • Graphical User Interface ?
  • Validation Procedure (also with ROOT)
  • Spectral Temporal analysis
  • The spike duration depends on the energy band of
    the light curve (harder spikes are shorter)
  • Variation of the spectral indexes in the time
  • Collect data of the MC response
  • Database ?
  • Starting the analysis

13
EC A nice signature
We compute the Photon Distribution _at_ 95 min after
the burst
(Inoue, Guetta Pacini)
Remember the 18 GeV Photon Detected by EGRET !!
For the SSC Model
for the EC Model
14
Scientific Working Groups
  • Group V (GRB Solar Flares)
  • Set up a web page to organize the activity of the
    Group, collect ideas, graphs, data, give
    visibility to the activity of the Group organize
    the work!
  • Cooperation with other W.G.
  • The GRB Simulator is a good example for
    describing a transient source and use it in the
    Gaudi framework. The basic structure could be
    extended to other astrophysical sources AGN
    simulator, high energy emission from microquasars
    (Arcetri).
  • Preparation to the Collaboration Meeting
  • Scientific Analysis Tools
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