2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/180940Recent observations from the Swift gamma-ray burst mission indicate that a fraction of gamma ray bursts are characterized by a canonical behaviour of the X-ray afterglows. We present an effective theory which allows us to account for X-ray light curves of both (short - long) gamma ray bursts and X-ray rich flashes. We propose that gamma ray bursts originate from massive magnetic powered pulsars.21 pages, 13 figures; accepted for publication in ApJAstrophysicsGeneral Relativity and Quantum CosmologyHigh Energy Physics - Phenomenologytext