FERMI-LAT-SCIENTIFIC PLOTS
1
Simulated gamma-ray burst spectra, showing the bro
ad energy range covered by
Fermi: (from left to right) the GBM NaI (blue band: 8–2000 keV), the GBM BGO (green:
150 keV–30 MeV) and the LAT (red curve: 20 MeV to
>300 GeV) detectors. The dashed curves are simple extrapolations of the typical GRB 10–1000 keV spectra into the GeV band, while the solid curves add an exponential cutoff that might result from absorption internal or external to the burst. The two different high energy photon indices β=-2.25 (black curves) and β=-2.5 (grey curves) demonstrate the dependence of the expected LAT flux on this photon index. There may be additional high energy components that are not known yet and are not shown in the figure.
1
Simulated gamma-ray burst spectra, showing the bro
ad energy range covered by
Fermi: (from left to right) the GBM NaI (blue band: 8–2000 keV), the GBM BGO (green:
150 keV–30 MeV) and the LAT (red curve: 20 MeV to
>300 GeV) detectors. The dashed curves are simple extrapolations of the typical GRB 10–1000 keV spectra into the GeV band, while the solid curves add an exponential cutoff that might result from absorption internal or external to the burst. The two different high energy photon indices β=-2.25 (black curves) and β=-2.5 (grey curves) demonstrate the dependence of the expected LAT flux on this photon index. There may be additional high energy components that are not known yet and are not shown in the figure.