High energy emission of GRB 130427A: evidence for inverse Compton radiation

Abstract

A nearby super-luminous burst GRB 130427A was simultaneously detected by six $\gamma$-ray space telescopes ({\it Swift}, Fermi-GBM/LAT, Konus-Wind, SPI-ACS/INTEGRAL, AGILE and RHESSI) and by three RAPTOR full-sky persistent monitors. The isotropic $\gamma -$ray energy release is of $\sim 10^{54}$ erg, rendering it the most powerful explosion among the GRBs with a redshift $z\le 0.5$. The emission above 100 MeV lasted about one day and four photons are at energies greater than 40 GeV. We show that the count rate of 100 MeV-100 GeV emission may be mainly accounted for by the forward shock synchrotron radiation and the inverse Compton radiation likely dominates at GeV-TeV energies. In particular, an inverse Compton radiation origin is established for the $\sim (95.3,47.3,41.4,38.5,32)$ GeV photons arriving at $t\sim (243,256.3,610.6,3409.8,34366.2)$ s after the trigger of Fermi-GBM. Interestingly, the external-inverse-Compton-scattering of the prompt emission (the second episode, i.e., $t\sim 120-260$ s) by the forward-shock-accelerated electrons is expected to produce a few $\gamma -$rays at energies above 10 GeV, while five were detected in the same time interval. A possible unified model for the prompt soft $\gamma -$ray, optical and GeV emission of GRB 130427A, GRB 080319B and GRB 090902B is outlined. Implication of the null detection of $>1$ TeV neutrinos from GRB 130427A by IceCube is discussed.

10 pages including 4 figures and 2 tables. Section 3.2 is added to discuss the limitation of alternative models for the >5 GeV afterglow emission. To appear in ApJ

References in corpus (20)

• Gamma-Ray Bursts: Progress, Problems & Prospects
• A Complete Catalog of Swift GRB Spectra and Durations: Demise of a Physical Origin for Pre-Swift High-Energy Correlations
• A Comprehensive Analysis of Fermi Gamma-Ray Burst Data. I. Spectral Components and Their Possible Physical Origins of LAT/GBM GRBs
• The Afterglow of GRB 130427A from 1 to 10^16 GHz
• Discovery of the broad-lined Type Ic SN 2013cq associated with the very energetic GRB 130427A
• High Energy Afterglow from Gamma-ray Bursts
• On the consistency of the peculiar GRBs 060218 and 060614 with the Ep,i - Eiso correlation
• Multiwavelength observations of GRB 110731A: GeV emission from onset to afterglow
• Revisiting the Long/Soft-Short/Hard Classification of Gamma-Ray Bursts in the Fermi Era
• MAGIC upper limits on the very high energy emission from GRBs
• Expected high energy emission from GRB 080319B and origins of the GeV emission of GRBs 080514B, 080916C and 081024B
• Observational Limits on Inverse Compton Processes in GRBs
• Interpretation of the unprecedentedly long-lived high-energy emission of GRB 130427A
• The photospheric radiation model for the prompt emission of Gamma-ray Bursts: Interpreting four observed correlations
• H.E.S.S. observations of gamma-ray bursts in 2003-2007
• GRB 090417B and its Host Galaxy: A Step Towards an Understanding of Optically-Dark Gamma-Ray Bursts
• Discovery of an extra hard spectral component in the high-energy afterglow emission of GRB 130427A
• Prompt optical emission from residual collisions in GRB outflows
• Very High Energy Observations of Gamma-Ray Burst Locations with the Whipple Telescope
• Fermi Large Area Telescope observations of GRB 110625A

Cited by in corpus (38)

• The Physics of Gamma-Ray Bursts and Relativistic Jets
• The DArk Matter Particle Explorer mission
• The Afterglow of GRB 130427A from 1 to 10^16 GHz
• Discovery of the broad-lined Type Ic SN 2013cq associated with the very energetic GRB 130427A
• NuSTAR Observations of GRB130427A establish a single component synchrotron afterglow origin for the late optical to multi-GeV emission
• Interpretation of the unprecedentedly long-lived high-energy emission of GRB 130427A
• On the magnetization of gamma-ray burst blast waves
• Fermi and Swift Observations of GRB 190114C: Tracing the Evolution of High-Energy Emission from Prompt to Afterglow
• Modeling the early multiwavelength emission in GRB130427A
• Gamma-Ray Bursts at high and very high energies
• A Search for Fast Radio Bursts Associated with Gamma-Ray Bursts
• A Monte Carlo Bayesian Search for the Plausible Source of the Telescope Array Hotspot
• Search for gamma-rays from the unusually bright GRB 130427A with the HAWC Gamma-ray Observatory
• Gamma-Ray Bursts as Sources of Strong Magnetic Fields
• The Possibility of Modeling the Very High Energy Afterglow of GRB 221009A in a Wind Environment
• Nonlinear particle acceleration and thermal particles in GRB afterglows
• Two Predictions of supernova: GRB 130427A / SN 2013cq and GRB 180728A / SN 2018fip
• The Bright Reverse Shock Emission in the Optical Afterglows of Gamma-ray Bursts in a Stratified Medium
• Pseudo-Dirac neutrinos via mirror-world and depletion of UHE neutrinos
• Modeling the high-energy emission in GRB 110721A and implications on the early multiwavelength and polarimetric observations
• Astrophysics: Extreme emission seen from $\gamma$-ray bursts
• Modelling synchrotron and synchrotron self-Compton emission of gamma-ray burst afterglows from radio to very-high energies
• Closure relations of Gamma Ray Bursts in high energy emission
• Temporal Evolution of the Gamma-ray Burst Afterglow Spectrum for an Observer: GeV--TeV Synchrotron Self-Compton Light Curve
• GRB Observational Properties
• Pair-dominated GeV-optical flash in GRB 130427A
• The 7.2/3 Years Collection of Well-Monitored Fermi-LAT GRB Afterglows
• Simulations of gamma-ray burst afterglows with a relativistic kinetic code
• GRB 131231A: Implications of the GeV emission
• An evolving GeV spectrum from prompt to afterglow: the case of GRB 160509A
• Time-dependent Multi-group Multidimensional Relativistic Radiative Transfer Code Based On Spherical Harmonic Discrete Ordinate Method
• An inverse Compton origin for the 55 GeV photon in the late afterglow of GRB 130907A
• High energy emission of GRB 130821A: constraining the density profile of the circum-burst medium as well as the initial Lorentz factor of the outflow
• Probing Gamma-Ray Burst afterglows with the Cherenkov Telescope Array
• Synchrotron and inverse-Compton emissions from pairs formed in GRB afterglows (analytical treatment)
• Spectral Diversities of Gamma-ray Bursts in High Energy Bands: Hints from Turbulent Cascade
• Optical Flashes from Internal Pairs Formed in Gamma-Ray Burst Afterglows
• The Very Bright and Nearby GRB 130427A: The Extra Hard Spectral Component and Implications for Very High-energy Gamma-ray Observations of Gamma-ray Bursts