Vol 6, No S1

GRBs, SGRs by UHE leptons showering, blazing and re-brightening by precessing Gamma Jets in-off axis

D. Fargion, M. Grossi


Abstract A list of questions regarding Gamma Ray Bursts (GRBs) and Soft Gamma Repeaters (SGRs) remain unanswered within the Fireball and Magnetar scenarios. We argue that a persistent, thin (less than few μsr) precessing and spinning gamma jet, with the same power (not just energy) of the progenitor supernova (SN) may explain these issues. The jets may have precessing time scales of a few hours but their lifetime, while decaying, could be as long as thousands of years. The orientation of the beam respect to the line of sight plays a key role in this scenario: the farthest GRB events correspond to a wider volume and mostly very narrow and on-axis beam, while for the nearest detectable ones has a the beam mostly off-axis. Relic neutron stars, anomalous X-ray Pulsars (AXRPs), with their spinning and precessing jets are the candidate blazing sources of earlier GRBs (born at Supernova peak activity) and late SGRs respectively. A side view of such a precessing jet may correspond to SS 433 and micro-quasars jet traces. The `delayed' gamma jets (even weeks or months after the SN) blazing the observer might appear without the earliest SN bright optical transient (OT), contrary to those events where the SN and the GRB occur nearly at the same time; the OT is the result of a wider beamed Jet polluted by the SN lights and baryon halos. Delayed jets are observable in the local universe as X-Ray Flahes (XRFs) or short GRBs and at closer distances as SGRs and anomalous X-ray Pulsars AXRPs.



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