Prompt high-energy emission from gamma-ray bursts in the internal shock model

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Volume 498 / No 3 (May II 2009)

A&A, 498 3 (2009) 677-703

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Table 1:

Physical diagnostics for *Fermi* data.
Observational constraints:
- Is there an additional component in the LAT spectrum?	no (or very weak)	yes	yes (possibly very intense)
- Is the LAT lightcurve in GeV range prolonged or delayed compared to GBM lightcurve?	yes (tail)	yes (delayed peak)	no (or very short delay)
Consequences:
Radiative processes:
Dominant process in GBM range	synchrotron	synchrotron	IC (first peak)
Dominant process in LAT range	synchrotron + very weak IC	synchrotron + IC	IC (second peak)
Conditions in shocked regions:
Electron distribution	high $\Gamma _{\rm m}$ , low $\zeta$	high $\Gamma _{\rm m}$ , low $\zeta$	moderate $\Gamma _{\rm m}$ , $\zeta\to 1$
Magnetic field	high ( $\epsilon_{\rm B}\to 1/3$ )	low ( $\epsilon_{\rm B}\ll 1$ )	low ( $\epsilon_{\rm B}\ll 1$ )
Properties of the relativistic outflow:
Can the Lorentz factor in the outflow be measured from the high-energy cutoff (assuming it is due to $\gamma \gamma$ annihilation)?	yes	yes	? (see text)

These diagnostics are based on the results shown in Sects. 4 and 5.

Source LaTeX | All tables | In the text

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