External Inverse-Compton Emission Associated with Extended and Plateau Emission of Short Gamma-Ray Bursts: Application to GRB 160821B - INSPIRE

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External Inverse-Compton Emission Associated with Extended and Plateau Emission of Short Gamma-Ray Bursts: Application to GRB 160821B

Dec 16, 2020

5 pages

Published in:

Astrophys.J.Lett. 908 (2021) 2, L36

Published: Feb 22, 2021

e-Print:

2012.09143 [astro-ph.HE]

DOI:

10.3847/2041-8213/abe0b0

View in:

ADS Abstract Service

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Abstract: (IOP)

The recent detection of TeV photons from two gamma-ray bursts (GRBs), GRB 190114C and GRB 180720B, has opened a new window for multimessenger and multiwavelength astrophysics of high-energy transients. We study the origin of very high energy (VHE) γ-rays from the short GRB 160821B, for which the MAGIC Collaboration reported a ∼3σ statistical significance. Short GRBs are often accompanied by extended and plateau emission, which is attributed to internal dissipation resulting from activities of a long-lasting central engine, and Murase et al. (2018) recently suggested the external inverse-Compton (EIC) scenario for VHE counterparts of short GRBs and neutron star mergers. Applying this scenario to GRB 160821B, we show that the EIC flux can reach ∼10−12 erg cm−2 s−1 within a time period of ∼103–104 s, which is consistent with the MAGIC observations. EIC γ-rays expected during the extended and plateau emission will be detectable with greater significance by future detectors such as the Cerenkov Telescope Array. The resulting light curve has a distinguishable feature, where the VHE emission is predicted to reach the peak around the end of the seed photon emission.

Note:

6 pages, 2 figures, accepted for publication in ApJL

gamma ray: burst
gamma ray: VHE
Cherenkov Telescope Array
photon
MAGIC
Compton scattering: inverse
neutron star
dissipation
statistical
flux

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