The afterglow of a relativistic shock breakout and low-luminosity GRBs

Understand

The prompt emission of low-luminosity gamma-ray bursts (llGRBs) indicates that these events originate from a relativistic shock breakout.

• In this case we can estimate, based on the properties of the prompt emission, the energy distribution of the ejecta.
• We develop a general formalism to estimate the afterglow produced by synchrotron emission from the forward shock resulting from the interaction of this ejecta with the circum-burst matter.
• We assess whether this emission can produce the observed radio and X-ray afterglows of the available sample of 4 llGRBs.