A new fitting function for GRB MeV spectra based on the internal shock synchrotron modelM. Yassine, F. Piron, F. Daigne, R. Mochkovitch, F. Longo, N. Omodei and G. VianelloA&A, 640 (2020) A91DOI: https://doi.org/10.1051/0004-6361/201937057
