Self-Similarities and Power-laws in the Time-resolved Spectra of GRB 190114C, GRB 130427A, GRB 160509A, and GRB 160625B

TL;DR

This study identifies self-similarities and power-law behaviors in the spectra of several gamma-ray bursts, revealing common properties and suggesting a standard composition and formation mechanism for BdHN I GRBs, with implications for fundamental physics.

Contribution

It demonstrates the presence of self-similar structures and power-laws in multiple GRB spectra, advancing the taxonomy of GRBs and proposing a unified model for BdHN I formation.

Findings

Validation of common spectral properties across multiple BdHN I GRBs

Identification of self-similar structures and power-laws in the UPE phase

Evidence for a discrete, quantized polarized emission on extremely short timescales

Abstract

[Shortened] CONTEXT: [...] AIMS: To identify and verify the BdHNe I properties in the additional sources GRB160509A, GRB160625B and GRB1340427A, and compare and contrast the results with the ones of a BdHN II source GRB180728A. We have also identified in all four sources, following the analysis GRB 130427A in the companion paper, the GeV radiation during and following the UPE phase. Also in all the four sources, we describe the spectral properties of their afterglow emission, including the mass estimate of the $\nu$NS, following the results presented in the companion paper. METHODS: [...] RESULTS: The results of the spectral analysis have validated the common properties in all BdHNe I: the three Episodes as well as the self-similar structures and the associated power-laws in the UPE phase. The profound similarities of the results have made a significant step forward in the taxonomy of GRBs and in evidencing a standard composition of the BdHN I. This opens the opportunity of a vaster inquire of the astrophysical nature of their components in the population synthesis approach: e.g., the BH formation in all BdHN I occurs due to accretion of the SN ejecta in a tight binary system with a neutron star companion which reaches its critical mass, leading to the formation of the BH. The SN-rise in all five BdHNe are compare and contrasted. CONCLUSIONS: The most far reaching discovery of self-similarities and power-laws here extensively confirmed, thanks also to the conclusions presented in the companion papers, leads to the existence of a discrete quantized repetitive polarized emission, both in the GeV and MeV observed by {\it Fermi}-GBM and {\it Fermi}-LAT, on a timescale as short as $10^{-14}$s. These results open new paths in the discovery of fundamental physical laws.