Title: GRB Spectrum simulating a transient source
1GRB Spectrumsimulating a transient source
- Status Report
- Nicola Omodei
- Johann Cohen-Tanugi
2The activities
- FluxSvc
- General Design
- GRBSpectrum
- GRBTest
- Some results (presented as picture gallery)
- Scientific Group Activities
3Flux 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.
4GRB 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
5How does the model work ?
6What does GRBSim do ?
7Light Curves
Short Bursts Long Bursts
Complex Shapes
The harder peaks are shorter and peak before
8Contour Plot
lt- Synchrotron
Time (sec)
Log(energy)
Time (sec)
Synchrotron IC -gt
Log(energy)
9Spectrum
Different Emission processes are included. The
Shape of the spectrum will be a key study to
understand the nature of this phenomenon.
10Waves, Mountains ? No GRBs !!
11Root 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
12To 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
-
13EC 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
14Scientific 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