Unveiling the origins of steep decay in γ-ray bursts

Ronchini, S. (2022) Unveiling the origins of steep decay in γ-ray bursts. Il nuovo cimento C, 45 (5). pp. 1-4. ISSN 1826-9885

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Abstract

γ-ray bursts (GRBs) are cataclysmic transient events which release most of their energy in the keV-MeV range. GRBs are originated from internal dissipation of the energy carried by ultra-relativistic jets launched by the remnant of a massive star’s death or a compact binary coalescence. With the discovery of gravitational waves associated to short GRBs, the investigation of this class of phenomena is crucial for the development of multi-messenger astrophysics. Though, we still have an incomplete understanding of where and how the radiation is generated in the jet. Performing a time-resolved spectral analysis of the X-ray tails of a sample of 8 bright GRBs, we discover a unique relation between the spectral index and flux. This relation is incompatible with the common scenario used to interpret X-ray tails, and requires to be explained with the adiabatic cooling of the emitting particles, suggesting a proton-synchrotron origin of the GRB emission.

Item Type:	Article
Subjects:	500 Scienze naturali e Matematica > 530 Fisica
Depositing User:	Marina Spanti
Date Deposited:	06 Sep 2022 12:59
Last Modified:	06 Sep 2022 12:59
URI:	http://eprints.bice.rm.cnr.it/id/eprint/22036

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