Relative Spacetime Transformations in Gamma-Ray Bursts

Ruffini, Remo; Bianco, C. L.; Fraschetti, Federico; Xue, She‐Sheng; Chardonnet, Pascal

doi:10.1086/323175

Cited by 97 publications

(227 citation statements)

References 45 publications

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“…Therefore we explain the unusually high values of the observed T 90 by our "fireshell" model (see Sect. 2 of this paper, Ruffini et al 2001aRuffini et al ,b, 2003Ruffini et al , 2005aRuffini 2004, 2005a,b, andreferences therein). After summarizing our model in Sect.…”

Section: Introductionmentioning

confidence: 87%

“…In this ultrarelativistic regime a more global approach is needed. The arrival time of each photon at the detector depends on the entire past history of the fireshell (Ruffini et al 2001a). All the observables depend on the equitemporal surfaces (EQTSs, which produce observable effects in a large part of the future history of the fireshell.…”

Section: The Fireshell Modelmentioning

confidence: 99%

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GRB 060218 and GRBs associated with supernovae Ib/c

Dainotti¹,

Bernardini²,

Bianco³

et al. 2007

A&A

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Context. The Swift satellite has given continuous data in the range 0.3-150 keV from 0 s to 10 6 s for GRB 060218 associated with SN2006aj. This Gamma-Ray Burst (GRB) which has an unusually long duration (T 90 ∼ 2100 s) fulfills the Amati relation. These data offer the opportunity to probe theoretical models for GRBs connected with Supernovae (SNe). Aims. We plan to fit the complete γ-and X-ray light curves of this long duration GRB, including the prompt emission, in order to clarify the nature of the progenitors and the astrophysical scenario of the class of GRBs associated with SNe Ib/c. Methods. We apply our "fireshell" model based on the formation of a black hole, giving the relevant references. It is characterized by the precise equations of motion and equitemporal surfaces and by the role of thermal emission. Results. The initial total energy of the electron-positron plasma E tot e ± = 2.32 × 10 50 erg has a particularly low value, similar to the other GRBs associated with SNe. For the first time, we observe a baryon loading B = 10 −2 which coincides with the upper limit for the dynamical stability of the fireshell. The effective CircumBurst Medium (CBM) density shows a radial dependence n cbm ∝ r −α with 1.0 < ∼ α < ∼ 1.7 and monotonically decreases from 1 to 10 −6 particles/cm 3 . This behavior is interpreted as being due to a fragmentation in the fireshell. Analogies with the fragmented density and filling factor characterizing Novae are outlined. The fit presented is particularly significant in view of the complete data set available for GRB 060218 and of the fact that it fulfills the Amati relation. Conclusions. We fit GRB 060218, usually considered as an X-Ray Flash (XRF), as a "canonical GRB" within our theoretical model. The smallest possible black hole, formed by the gravitational collapse of a neutron star in a binary system, is consistent with the especially low energetics of the class of GRBs associated with SNe Ib/c. We provide the first evidence for a fragmentation in the fireshell. This fragmentation is crucial in explaining both the unusually large T 90 and the consequently inferred abnormally low value of the CBM effective density.

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Section: Introductionmentioning

confidence: 87%

Section: The Fireshell Modelmentioning

confidence: 99%

GRB 060218 and GRBs associated with supernovae Ib/c

Dainotti¹,

Bernardini²,

Bianco³

et al. 2007

A&A

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show abstract

“…In the fireshell model [6][7][8], the GRB emission originate from an optically thick e + e − plasma of total energy E tot e + e − -the fireshell. Its expansion and self-acceleration is due to the gradual e + e − annihilation [59].…”

Section: The Fireshell Modelmentioning

confidence: 99%

“…Thanks to the extensive data collected by γ-ray telescopes, such as AGILE, BATSE, BeppoSAX, Fermi, HETE-II, INTEGRAL, Konus/WIND and Swift, to more sofisticated time-resolved spectral analyses, and to the theoretical treatment of the fireshell model [6][7][8] it has become evident that both long and short bursts originate from binary progenitors and that they can be further subdivided into a variety of sub-classes, depending on the evolution of these binary systems [9][10][11].…”

Section: Introductionmentioning

confidence: 99%

“…For progenitor system composed of a CO core in binary with an already formed BH [8,42], leading to bursts with E iso 10 54 erg and E p,i 2 MeV, the observational identification is still pending. In these systems, which correspond to the late evolutionary stages of X-ray binaries as Cyg X-1 and Cyg X-3 [50], or microquasars [51], the hypercritical accretion produces, as out-states, a more massive BH and a νNS.…”

Section: Introductionmentioning

confidence: 99%

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What can we learn from GRBs?

et al. 2018

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Abstract. We review our recent results on the classification of long and short gamma-ray bursts (GRBs) in different subclasses. We provide observational evidences for the binary nature of GRB progenitors. For long bursts the induced gravitational collapse (IGC) paradigm proposes as progenitor a tight binary system composed of a carbon-oxygen core (CO core ) and a neutron star (NS) companion; the supernova (SN) explosion of the CO core triggers a hypercritical accretion process onto the companion NS. For short bursts a NS-NS merger is traditionally adopted as the progenitor. We also indicate additional sub-classes originating from different progenitors: (CO core )-black hole (BH), BH-NS, and white dwarf-NS binaries. We also show how the outcomes of the further evolution of some of these sub-classes may become the progenitor systems of other sub-classes.

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Observational Tests of the Electro-Magnetic Black Hole Theory in Gamma Ray Bursts

Ruffini

Eso Astrophysics Symposia

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The Relative Space-Time Transformation (RSTT) Paradigm [44] and the Interpretation of the Burst Structure (IBS) Paradigm [45] are applied to the analysis of the structure of the burst and afterglow of Gamma-Ray Bursts within the theory based on the vacuum polarization process occurring in an Electro-Magnetic Black Hole, the EMBH theory. This framework is applied to the study of the GRB 991216 which is used as a prototype. The GRB-Supernova Time Sequence (GSTS) Paradigm, which introduces the concept of induced gravitational collapse in the Supernovae-GRB association [46], is announced and will be applied, within the EMBH theory, to GRB 980425 as a prototype in a forthcoming paper.

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Relative Spacetime Transformations in Gamma-Ray Bursts

Cited by 97 publications

References 45 publications

GRB 060218 and GRBs associated with supernovae Ib/c

GRB 060218 and GRBs associated with supernovae Ib/c

What can we learn from GRBs?

Observational Tests of the Electro-Magnetic Black Hole Theory in Gamma Ray Bursts

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