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GRB 090510: Early LAT Emission is not from External Shock.
- Source :
-
AIP Conference Proceedings . 8/19/2011, Vol. 1358 Issue 1, p191-194. 4p. 1 Graph. - Publication Year :
- 2011
-
Abstract
- Long-lived high-energy (>100 MeV) emission, a common feature of most Fermi-LAT detected gamma-ray burst, is detected up to ∼102 s in the short GRB 090510. We study the origin of this long-lived high-energy emission, using broad-band observations including X-ray and optical data. We confirm that the late >100 MeV, X-ray and optical emission can be naturally explained via synchrotron emission from an adiabatic forward shock propagating into a homogeneous ambient medium with low number density under significant Klein-Nishina effects. Under the constraints from the low-energy observations, the adiabatic forward shock synchrotron emission is consistent with the later-time (t>2 s) high-energy emission, but falls below the early-time (t<2 s) high energy emission. Thus we argue that an extra high energy component is needed at early times. A standard reverse shock origin is found to be inconsistent with this extra component. Therefore, we attribute the early part of the high-energy emission (t<2 s) to the prompt component, and the long-lived high energy emission (t>2 s) to the adiabatic forward shock synchrotron afterglow radiation. This avoids the requirement for an extremely high initial Lorentz factor. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 0094243X
- Volume :
- 1358
- Issue :
- 1
- Database :
- Academic Search Index
- Journal :
- AIP Conference Proceedings
- Publication Type :
- Conference
- Accession number :
- 64841298
- Full Text :
- https://doi.org/10.1063/1.3621769