Talk detail

Participant	Levinson, Amir
Institution	Tel Aviv University - Ramat Aviv - Tel Aviv - israel - Israel

Session	GRB1	Accepted		Order	Time
Talk	Oral abstract	Title	Observational signatures of sub-photospheric shocks in GRBs
Co-authors
Abstract	I will discuss the structure and emission of radiation mediated shocks that form below the photosphere of a GRB outflow. I will argue that unlike collisionless shocks, radiation mediated shocks cannot accelerate particles to nonthermal energies, as their characteristic scale, a few Thomson depths, is larger than any kinetic scale involved by several orders of magnitudes. I will present recent calculations of the spectrum emitted from photosphere following shock breakout, and elucidate the dependence of the spectral shape on the temperature profile downstream of the shock.