Multiwavelength radiation models for low-luminosity GRBs and the implications for UHECRs

We study the prompt phase of low-luminosity Gamma-Ray Bursts (ll-GRBs) as potential source very-high-energy (VHE) gamma rays and Ultra-High-Energy Cosmic Rays (UHECRs). Within internal shock model we choose parameters for relativistic outflow such that our representative events have observed properties similar to GRBs 980425, 100316D 120714B self-consistently calculate full spectral temporal in a leptonic synchrotron self-Compton scenario. To investigate conditions under which inverse Compton radiation may lead peak GeV--TeV range, vary fraction energy supplying magnetic field. Further, determine maximal energies achievable UHECR nuclei derive constraints on baryonic loading/typical duration by comparing extragalactic gamma-ray background. find ll-GRBs are targets multiwavelength studies reach Imaging Atmospheric Cherenkov Telescopes (IACTs) optical/UV instruments. For comparable sub-MeV emission dynamical evolution outflow, weak (strong) fields induce high (low) fluxes VHE regime low (high) optical. be suppressed $\gamma \gamma$-absorption close engine or interactions with background light redshifts $z > 0.1$. UHECRs, iron (protons) can $\simeq 10^{11}$~GeV ($10^{10}$~GeV) if density is large (and component correspondingly weak). These possible decoupling production regions gamma-rays multizone model. Finally, basic consistency budget needed accommodate origin from ll-GRBs.