2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/97386It is shown that in the duration-hardness plane the GRBs of the third intermediate subgroup are well defined. Their durations are intermediate (i.e. roughly between 2 and 10 seconds), but their hardnesses are the lowest. They are even softer than the long bursts.Published in Baltic AstronomyAstrophysicstext