author={David Eichler},
  journal={The Astrophysical Journal},
  • D. Eichler
  • Published 2 February 2014
  • Physics
  • The Astrophysical Journal
It is suggested that many gamma-ray bursts (GRBs) are cloaked by an ultrarelativistic baryonic shell that has high optical depth when the photons are manufactured. Such a shell would not fully block photons reflected or emitted from its inner surface, because the radial velocity of the photons can be less than that of the shell. This avoids the standard problem associated with GRBs that the thermal component should be produced where the flow is still obscured by high optical depth. The… 
Short Gamma-Ray Bursts Viewed from Far Off-axis
The recent radio observations (Mooley et al, 2018) of a superluminal radio afterglow following GRB 170817A are interpreted in terms of a jet impacting a baryonic cloak, which is presumably the
Testing the Viewing Angle Hypothesis for Short GRB with LIGO events
It has been suggested that short gamma ray bursts (GRBs) have shorter or undetectable spectral lags than long GRB because in the former, the observer's line of sight makes a larger angle with the GRB
Predicting Spectral Parameters in the Backscattering-dominated Model for the Prompt Phase of GRBs
We present new results of the backscattering-dominated prompt emission model in which the photons generated through pair annihilation at the center of a gamma-ray burst (GRB) are backscattered
Effect of Fluid Composition on a Jet Breaking out of a Cocoon in Gamma-Ray Bursts: A Relativistic de Laval Nozzle Treatment
In this paper we carry out a semi-analytic general relativistic study of a Gamma-Ray Bursts (GRB) jet that is breaking out of a cocoon or stellar envelope. We solve hydrodynamic equations with the
GRB prompt phase spectra under backscattering dominated model
We propose a backscattering dominated prompt emission model for gamma ray bursts (GRB) prompt phase in which the photons generated through pair annihilation at the centre of the burst are


Shading and Smothering of Gamma-Ray Bursts
GRB 980425 is distinctive in that it seems to be associated with SN 1998bw, has no X-ray afterglow, and has a rounded, structureless, single-peak light curve and a relatively soft spectrum. The
A Model for Fast Rising, Slowly Decaying Subpulses in γ-ray Bursts
Gamma-ray bursts (GRBs) often feature subpulses that have a distinctively asymmetric profile—they rise quickly and decay much more slowly, while their spectrum softens slightly with observer time. It
Baryon Loading of Gamma-Ray Burst by Neutron Pickup
It is proposed that the baryons in gamma-ray burst (GRB) fireballs originate as "pickup" neutrons that leak in sideways from surrounding baryonic matter and convert to protons in a collision
The statistical distribution of energies among particles responsible for long gamma-ray burst (GRB) emission is analyzed in light of recent results of the Fermi Observatory. The all-sky flux, F{sub
The Collimation-corrected Gamma-Ray Burst Energies Correlate with the Peak Energy of Their νFν Spectrum
We consider all bursts with known redshift and νFν peak energy, E. For a good fraction of them an estimate of the jet opening angle is available from the achromatic break of their afterglow light
On thermalization in gamma-ray burst jets and the peak energies of photospheric spectra
The low energy spectral slopes of the prompt emission of most gamma-ray bursts (GRBs) are difficult to reconcile with radiatively efficient optically thin emission models irrespective of the
Discovery of a cosmological, relativistic outburst via its rapidly fading optical emission
We report the discovery by the Palomar Transient Factory (PTF) of the transient source PTF11agg, which is distinguished by three primary characteristics: (1) bright (Rpeak = 18.3mag), rapidly fading
The Blast Energy Efficiency of Gamma-Ray Bursts
Using data mostly assembled by previous authors, we note a linear correlation for 17 of 22 gamma-ray bursts (GRBs) between the apparent radiative efficiency γ (defined as the ratio of isotropic
Particle acceleration in high-energy gamma-ray sources
Many proficient gamma-ray sources show energy spectra that are consistent with E −2 primary spectra. Such sources include recently identified gamma-ray quasars and some gamma-ray bursts. Assuming
Global Properties of X-Ray Flashes and X-Ray-Rich Gamma-Ray Bursts Observed by Swift
It is found that the light curves of C-GRB afterglows show a break to steeper indices (shallow-to-steep break) at much earlier times than do XRF after glows, and the overall luminosity of XRF X-ray afterglow is systematically smaller by a factor of 2 or more compared to that ofC-GRBs.