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Very-high-energy (VHE; $\geq 10$ GeV) photons are expected from the nearestand brightest Gamma-ray bursts (GRBs). VHE photons, at energies higher than 300GeV, were recently reported by the MAGIC collaboration for this burst.Immediately, GRB 190114C was followed up by a massive observational campaigncovering a large fraction of the electromagnetic spectrum. In this paper, weobtain the LAT light curve of GRB 190114C and show that it exhibits similarfeatures to other bright LAT-detected bursts; the first high-energy photon($\geq$ 100 MeV) is delayed with the onset of the prompt phase and the fluxlight curve exhibits a long-lived emission (lasting much longer than the promptphase) and a short-lasting bright peak (located at the beginning of long-livedemission). Analyzing the multi-wavelength observations, we show that theshort-lasting LAT and GBM bright peaks are consistent with the synchrotronself-Compton reverse-shock model and the long-lived observations with thestandard synchrotron forward-shock model that evolves from a stratifiedstellar-wind like medium to a uniform ISM-like medium. Given the best-fitvalues, a bright optical flash produced by synchrotron reverse-shock emissionis expected. From our analysis we infer that the high-energy photons areproduced in the deceleration phase of the outflow and some additional processesto synchrotron in the forward shocks should be considered to properly describethe LAT photons with energies beyond the synchrotron limit. Moreover, we claimthat an outflow endowed with magnetic fields could describe the polarizationand properties exhibited in the light curve of GRB 190114C.

Analysis and modelling of the multi-wavelength observations of the luminous GRB 190114C