Since 2018, a new style of research has been introduced in gamma-ray-burst (GRB) studies: It does not describe the prompt radiation phase observed by the Neil Gehrels Swift Observatory and the NASA Fermi Gamma-ray Space Telescope by a time-integrated spectral analysis. Such analyses are typically applied to long GRBs and obtain a band spectrum with various fitting parameters. This procedure, as recognized by David Band, does not permit a taxonomy of GRBs.
Source:
https://phys.org/news/2019-10-role-cavity-hypernova-ejecta-gamma-ray.html