A marginally fast-cooling proton-synchrotron model for prompt GRBs

Ioulia Florou, Maria Petropoulou, Apostolos Mastichiadis

A small fraction of GRBs with available data down to soft X-rays ($\sim 0.5$ keV) have been shown to feature a spectral break in the low-energy part ($\sim 1-10$ keV) of their prompt…