Modeling Synchrotron Self-Compton and Klein-Nishina Effects in Gamma-Ray Burst Afterglows

Abstract

We present a self-consistent way of modeling synchrotron self-Compton (SSC) effects in gamma-ray burst afterglows, with and without approximated Klein-Nishina suppressed scattering. We provide an analytic approximation of our results, so that it can be incorporated into the afterglow modeling code \texttt{boxfit}, which is currently based on pure synchrotron emission. We discuss the changes in spectral shape and evolution due to SSC effects, and comment on how these changes affect physical parameters derived from broadband modeling. We show that SSC effects can have a profound impact on the shape of the X-ray light curve using simulations including these effects. This leads to data that cannot be simultaneously fit well in both the X-ray and radio bands when considering synchrotron-only fits, and an inability to recover the correct physical parameters, with some fitted parameters deviating orders of magnitude from the simulated input parameters. This may have a significant impact on the physical parameter distributions based on previous broadband modeling efforts.

arXiv comment15 pages, 11 figures, 6 tables. Submitted to MNRAS

References in corpus (34)

• The NumPy array: a structure for efficient numerical computation
• Spectra and Light Curves of Gamma-Ray Burst Afterglows
• The Dynamics and Light Curves of Beamed Gamma Ray Burst Afterglows
• The Shape of Spectral Breaks in GRB Afterglows
• On The Synchrotron Self-Compton Emission from Relativistic Shocks and Its Implications for Gamma-Ray Burst Afterglows
• Shocked by GRB 970228: the afterglow of a cosmological fireball
• Physical parameters of GRB 970508 and GRB 971214 from their afterglow synchrotron emission
• Gamma-Ray Burst Environments and Progenitors
• A very-high-energy component deep in the Gamma-ray Burst afterglow
• Observation of inverse Compton emission from a long $\gamma$-ray burst
• Klein-Nishina Effects on Optically Thin Synchrotron and Synchrotron Self-Compton Spectrum
• A cocoon shock breakout as the origin of the $\gamma$-ray emission in GW170817
• Off-Axis Gamma-Ray Burst Afterglow Modeling Based On A Two-Dimensional Axisymmetric Hydrodynamics Simulation
• Gamma-ray burst afterglow broadband fitting based directly on hydrodynamics simulations
• Energies of GRB blast waves and prompt efficiencies as implied by modeling of X-ray and GeV afterglows
• Afterglow Lightcurves from Misaligned Structured Jets
• The Optical Afterglow of GW170817: An Off-axis Structured Jet and Deep Constraints on a Globular Cluster Origin
• A Revised Analysis of Gamma Ray Bursts' prompt efficiencies
• A comprehensive study of GRB 070125, a most energetic gamma ray burst
• X-ray Plateaus in Gamma Ray Bursts' light-curves from jets viewed slightly off-axis
• Electrons' energy in GRB afterglows implied by radio peaks
• Observational constraints on the structure of gamma-ray burst jets
• Synchrotron self-Compton emission from external shocks as the origin of the sub-TeV emission in GRB 180720B and GRB 190114C
• On the magnetization of gamma-ray burst blast waves
• Constraining the Outflow Structure of the Binary Neutron Star Merger Event GW170817 with Markov-Chain Monte Carlo Analysis
• Synchrotron self-Compton as a likely mechanism of photons beyond the synchrotron limit in GRB 190114C
• Clustering of LAT light curves: a clue to the origin of high-energy emission in Gamma-Ray Bursts
• GW170817 Afterglow Reveals that Short Gamma-Ray Bursts are Neutron Star Mergers
• The physical conditions of the afterglow implied by MAGIC's sub-TeV observations of GRB 190114C
• The short GRB 170817A: Modelling the off-axis emission and implications on the ejecta magnetization
• Numerical Simulations of an Initially Top-Hat Jet and the Afterglow of GW170817/GRB170817A
• The synchrotron-self-Compton spectrum of relativistic blast waves at large Y
• Simulation and physical model based gamma-ray burst afterglow analysis
• Deceleration of relativistic jets with lateral expansion

Cited by in corpus (17)

• Two-component jet model for multiwavelength afterglow emission of the extremely energetic burst GRB 221009A
• A tale of two mergers: constraints on kilonova detection in two short GRBs at z$\sim$0.5
• Exploring the GRB population: Robust afterglow modelling
• Off-axis jet scenario for early afterglow emission of low-luminosity gamma-ray burst GRB 190829A
• The First Short GRB Millimeter Afterglow: The Wide-Angled Jet of the Extremely Energetic SGRB 211106A
• Evidence of extended emission in GRB 181123B and other high-redshift short GRBs
• Synchrotron Self-Compton Emission in the Two-Component Jet Model for Gamma-Ray Bursts
• Very High Energy Afterglow of Structured Jets: GW 170817 and Prospects for Future Detections
• The triple-peaked afterglow of GRB 210731A from X-ray to radio frequencies
• Probing Gamma-Ray Burst afterglows with the Cherenkov Telescope Array
• Two-component jet model for the afterglow emission of GRB 201216C and GRB 221009A and implications for jet structure of very-high-energy gamma-ray bursts
• Follow-up of Neutron Star Mergers with CTA and Prospects for Joint Detection with Gravitational-Wave Detectors
• New Insights on Gamma-Ray Burst Radiation Mechanisms from Multiwavelength Observations
• Jet-Cocoon Geometry in the Optically Dark, Very High Energy Gamma-ray Burst 201216C
• EP250108a/SN2025kg: A Magnetar-powered Gamma-Ray Burst Supernova Originating from a Close Helium-star Binary via Isolated Binary Evolution
• Numerical simulations of internal shocks in spherical geometry: hydrodynamics and prompt emission
• The impact of kilonova seed photons on GRB VHE emission