Corsi, A. and Guetta, D. and Piro, L. (2010) GeV emission from short gamma-ray bursts: the case of GRB 081024B. Astronomy and Astrophysics, 524 . A92. ISSN 0004-6361. http://resolver.caltech.edu/CaltechAUTHORS:20110106-100135544
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Aims. We investigate whether the high energy tail detected by the Fermi/LAT for the short GRB 081024B can be caused by synchrotron and self-Compton emission in the context of either the internal or external shock models. Methods. For the internal shock scenario, we explore the possibility of generating the high energy photons directly by means of the synchrotron process, or inverse Compton emission in which target photons are synchrotron photons produced in internal shocks taking place in a lately emitted shell (delayed internal shocks). In the external shock scenario, we test whether the high energy tail can be an extension of the afterglow synchrotron emission, or alternatively the inverse Compton component associated with the afterglow synchrotron photons. Results. For the internal shock scenario, we conclude that only an inverse Compton component from delayed internal shocks can explain the high energy tail that extends to the GeV range. In the external shock scenario, we show that the high energy tail may be interpreted as synchrotron afterglow emission, if the slow cooling phase starts as early as a few seconds after the trigger. On the other hand, the observed high energy tail is consistent with an inverse Compton component of the afterglow in the fast cooling regime.
|Additional Information:||© 2010 ESO. Received 10 May 2009; Accepted 26 August 2010; Published online 25 November 2010. We thank the anonymous referee of this paper for providing very useful comments on our work. We thank Alessandra Galli for valuable discussions. A. Corsi is grateful to the Italian L’Oreal-UNESCO program “For Women in Science” for support. The authors acknowledge the support of ASI-INAF contract I/088/06/0 and of EGO – European Gravitational Wave Observatory.|
|Subject Keywords:||gamma-rays burst: individual: GRB 081024B; X-rays: individuals: GRB 081024B; X-rays: bursts; radiation mechanisms: non-thermal|
|Official Citation:||GeV emission from short gamma-ray bursts: the case of GRB 081024B A. Corsi, D. Guetta and L. Piro A&A 524 A92 (2010) DOI: 10.1051/0004-6361/200912461|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Jason Perez|
|Deposited On:||06 Jan 2011 20:15|
|Last Modified:||26 Dec 2012 12:49|
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