Modeling the Early Afterglow in the Short and Hard GRB 090510

Fraija, N.; Lee, W. H.; Vereš, P.; Duran, R. Barniol

doi:10.3847/0004-637x/831/1/22

Cited by 38 publications

(49 citation statements)

References 73 publications

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“…Taking into account the best-fit values of the rise and decay indexes, the electron spectral indexes are 2.64 ± 0.22 and 2.42 ± 0.06, respectively. Considering the reverse shock evolving in a thin shell and in a homogenous medium, the Lorentz factor is bounded by the critical Lorentz factor Γ < Γ c the maximum flux and the cutoff energy break of the SSC emission, respectively Fraija et al 2016b).…”

Section: Analysis Of the X-ray Flarementioning

confidence: 99%

Modeling the Observations of GRB 180720B: from Radio to Sub-TeV Gamma-Rays

Fraija¹,

Dichiara

Pedreira³

et al. 2019

ApJ

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Early and late multiwavelength observations play an important role in determining the nature of the progenitor, circumburst medium, physical processes and emitting regions associated to the spectral and temporal features of bursts. GRB 180720B is a long and powerful burst detected by a large number of observatories in multiwavelenths that range from radio bands to sub-TeV gamma-rays. The simultaneous multiwavelength observations were presented over multiple periods of time beginning just after the trigger time and extending for more than 30 days. The temporal and spectral analysis of Fermi LAT observations suggests that it presents similar characteristics to other bursts detected by this instrument. Coupled with X-ray and optical observations, the standard external-shock model in a homogeneous medium is favored by this analysis. The X-ray flare is consistent with the synchrotron self-Compton (SSC) model from the reverse-shock region evolving in a thin shell and long-lived LAT, X-ray and optical data with the standard synchrotron forward-shock model. The best-fit parameters derived with the Markov chain Monte Carlo simulations indicate that the outflow is endowed with magnetic fields and that the radio observations are in the self-absorption regime. The SSC forward-shock model with our parameters can explain the LAT photons beyond the synchrotron limit as well as the emission recently reported by the HESS Collaboration. Subject headings: Gamma-rays bursts: individual (GRB 180720B) -Physical data and processes: acceleration of particles -Physical data and processes: radiation mechanism: nonthermal -ISM: general -magnetic fields 1 https://fermi.gsfc.nasa.gov/ssc/observations/types/grbs/lat grbs/ arXiv:1905.13572v2 [astro-ph.HE]

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Section: Analysis Of the X-ray Flarementioning

confidence: 99%

Modeling the Observations of GRB 180720B: from Radio to Sub-TeV Gamma-Rays

Fraija¹,

Dichiara

Pedreira³

et al. 2019

ApJ

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“…(2) The phenomenological model can describe the GRB phenomena without specifying any physical models. Then, the results obtained based on the phenomenological model is applicable for a number of GRB emission models, e.g., the internal shock model (Rees & Mészáros 1994), the photosphere emission model (Goodman 1986;Paczynski 1986;Thompson 1994;Mészáros, & Rees 2000), the internal-collision induced magnetic reconnection and turbulence (Zhang & Yan 2011;Deng et al 2016), and the external reverse shock model (e.g., Shao & Dai 2005;Kobayashi et al 2007;Fraija 2015;Fraija et al 2016). In the phenomenological model, the observed flux density of a GRB pulse is modeled with…”

Section: High-energy Spectral Lag In the Physical Modelmentioning

confidence: 99%

Spectral Lag for a Radiating Jet Shell with a High-energy Cutoff Radiation Spectrum

Lin

et al. 2019

ApJ

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Recent research shows that the spectral lag is closely related to the spectral evolution in GRBs. In this paper, we study the spectral lag for a radiating jet shell with a high-energy cut-off radiation spectrum. For the jet shell with a cut-off power-law spectrum, the spectral lag monotonically increases with the photon energy and levels off at a certain photon energy. It is the same for the jet shell with a Band cut-off spectrum (Bandcut). However, a turn-over from the positive lags to negative lags appears in the high-energy range for the jet shell with Bandcut, which is very similar to that observed in GRB 160625B. The dependence of the spectral lags on the spectral shape/evolution are studied in details. In addition, the spectral lag behavior observed in GRB 160625B is naturally reproduced based on our theoretical outcome.

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“…, where E syn γ,c and E syn γ,m are the synchrotron spectral breaks for the cooling and characteristic energies, respectively [5]. Relativistic electrons accelerated in the forward shocks could scatter synchrotron photons up to energies larger than 100 GeV.…”

Section: Modelmentioning

confidence: 99%

“…In general, the external medium can present a constant density profile (e.g. interstellar medium; ISM, see [5]), a stellar wind profile (e,g [6,7,8]) or a combination of these two (e.g. [9]).…”

Section: Introductionmentioning

confidence: 99%