Prospects for GeV-TeV detection of short gamma-ray bursts with extended emission

Abstract

We discuss the GeV to TeV photon emission of gamma-ray bursts (GRBs) within the refreshed shock and the continuous injection scenarios, motivated by the observation of extended emission in a substantial fraction of short GRBs. In the first model we assume that the central engine emits promptly material with a range of Lorentz factors. When the fastest shell starts to decelerate, it drives a forward shock into the ambient medium and a reverse shock in the ejecta. These shocks are reenergized by the slower and later arriving material. In the second model we assume that there is a continued ejection of material over an extended time, and the continuously arriving new material keeps reenergizing the shocks formed by the preceding shells of ejecta. We calculate the synchrotron and synchrotron self-Compton radiation components for the forward and reverse shocks and find that prospective and current GeV to TeV range instruments such as CTA, HAWC, VERITAS, MAGIC and HESS have a good chance to detect afterglows of short bursts with extended emission, assuming a reasonable response time.

9 pages, 17 figures, accepted by ApJ. Added discussion and corrections to accomodate referee's requests. New compared to previous version: X-ray lightcurve, MAGIC telescope sensitivity and brief discussion on the effects of intergalactic magnetic field

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• Search for gamma-rays from the unusually bright GRB 130427A with the HAWC Gamma-ray Observatory
• Modeling the early afterglow in the short and hard GRB 090510
• Cherenkov Telescope Array is Well Suited to Follow Up Gravitational Wave Transients
• Upscattered Cocoon Emission in Short Gamma-ray Bursts as High-energy Gamma-ray Counterparts to Gravitational Waves
• Searching for Gamma-Ray counterparts to Gravitational Waves from merging binary neutron stars with the Cherenkov Telescope Array
• The origin of very-high-energy gamma-rays from GRB 221009A: implications for reverse shock proton synchrotron emission
• The H.E.S.S. Gravitational Wave Rapid Follow-up Program
• Hunting Gravitational Waves with Multi-Messenger Counterparts: Australia's Role
• Statistical properties of Fermi GBM GRBs' spectra
• Probing the environment of gravitational wave transient sources with TeV afterglow emission