Cloaked Gamma Ray Bursts

Abstract

It is suggested that many $\gamma$-ray bursts (GRBs) are cloaked by an ultra-relativistic 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 radiation that escapes high optical depth obeys the Amati relation. Observational implications may include a) anomalously high ratios of afterglow to prompt emission, such as may have been the case in the recently discovered PTF 11agg, and b) ultrahigh-energy neutrino pulses that are non-coincident with detectable GRB. It is suggested that GRB 090510, a short, very hard GRB with very little afterglow, was an {\it exposed} GRB, in contrast to those cloaked by baryonic shells. \end{abstract}

accepted for publication in the Astrophysical Journal

References in corpus (4)

• Global Properties of X-Ray Flashes and X-Ray-Rich Gamma-Ray Bursts Observed by Swift
• Spectral Lags Explained as Scattering from Accelerated Scatterers
• A Model for Fast Rising, Slowly Decaying Subpulses in Gamma-Ray Bursts
• A Universal Central Engine Hypothesis for Short and Long GRBs

Cited by in corpus (10)

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• Testing the Viewing Angle Hypothesis for Short GRB with LIGO events
• Differential Source Count for Gamma Ray Bursts
• Effect of Fluid Composition on a Jet Breaking Out of a Cocoon in Gamma-ray Bursts: A Relativistic de Laval Nozzle Treatment
• Exploring Jet Structure and Dynamics in Short Gamma Ray Bursts: A Case Study on GRB 090510
• Luminosity Selection for Gamma Ray Burst
• Plug Disintegration in GRB Jet Eruption