| Issue |
EAS Publications Series
Volume 61, 2013
Gamma-ray Bursts: 15 Years of GRB Afterglows – Progenitors, Environments and Host Galaxies from the Nearby to the Early Universe
|
|
|---|---|---|
| Page(s) | 53 - 57 | |
| Section | Chapter II: Prompt Emission-I Observations | |
| DOI | https://doi.org/10.1051/eas/1361006 | |
| Published online | 22 July 2013 | |
A.J. Castro-Tirado, J.Gorosabel and I.H. Park (eds)
EAS Publications Series, 61 (2013) 53-57
Photospheric Emission from Gamma-Ray Bursts
1 Oskar Klein Center, Department of
Physics, Stockholm University, 106 91
Stockholm,
Sweden
2 Department of Physics, KTH Royal
Institute of Technology, 106
91
Stockholm,
Sweden
In spite of extensive research over the past decades, a complete physical picture of the origin of the prompt gamma-ray burst emission is still lacking. During recent years, evidence has been accumulating that the jet photosphere plays an important role. In this paper we summarize the lessons learned from Fermi observations regarding the behavior of the photosphere and discuss why photospheric emission does not necessarily appear as blackbody radiation. We concentrate on two strong and important bursts, GRB 090902B and GRB 110721A, which serve as examples of the standard appearance photospheric emission may have in gamma-ray burst spectra.
© EAS, EDP Sciences 2013