Long gamma-ray burst light curves as the result of a common stochastic pulse-avalanche process
arXiv:2403.18754 · doi:10.1051/0004-6361/202450150
Abstract
Context. The complexity and variety exhibited by the light curves of long gamma-ray bursts (GRBs) enclose a wealth of information that still awaits being fully deciphered. Despite the tremendous advance in the knowledge of the energetics, structure, and composition of the relativistic jet that results from the core collapse of the progenitor star, the nature of the inner engine, how it powers the relativistic outflow, and the dissipation mechanisms remain open issues. Aims. A promising way to gain insights is describing GRB light curves as the result of a common stochastic process. In the Burst And Transient Source Experiment (BATSE) era, a stochastic pulse avalanche model was proposed and tested through the comparison of ensemble-average properties of simulated and real light curves. Here we aim to revive and further test this model. Methods. We apply it to two independent data sets, BATSE and Swift/BAT, through a machine learning approach: the model parameters are optimised using a genetic algorithm. Results. The average properties are successfully reproduced. Notwithstanding the different populations and passbands of both data sets, the corresponding optimal parameters are interestingly similar. In particular, for both sets the dynamics appears to be close to a critical state, which is key to reproduce the observed variety of time profiles. Conclusions. Our results propel the avalanche character in a critical regime as a key trait of the energy release in GRB engines, which underpins some kind of instability.
arXiv commentAccepted by A&A, 9 pages, 3 figures. Code available at: https://github.com/LBasz/geneticgrbs/tree/arxiv-v1
References in corpus (56)
- SciPy 1.0--Fundamental Algorithms for Scientific Computing in Python
- Array Programming with NumPy
- The NumPy array: a structure for efficient numerical computation
- Collapsars - Gamma-Ray Bursts and Explosions in "Failed Supernovae"
- The Burst Alert Telescope (BAT) on the Swift MIDEX Mission
- Gamma-Ray Bursts as the Death Throes of Massive Binary Stars
- Unsteady Outflow Models for Cosmological Gamma-Ray Bursts
- Are Gamma-Ray Bursts in Star Forming Regions?
- Discovery of the X-Ray Afterglow of the Gamma-Ray Burst of February 28 1997
- Reconnection in a Weakly Stochastic Field
- The Physics of Gamma-Ray Bursts and Relativistic Jets
- The Internal-Collision-Induced Magnetic Reconnection and Turbulence (ICMART) Model of Gamma-Ray Bursts
- Can internal shocks produce the variability in GRBs?
- Swift detects a remarkable gamma-ray burst, GRB 060614, that introduces a new classification scheme
- Bright X-ray Flares in Gamma-Ray Burst Afterglows
- The Fourth BATSE Gamma-Ray Burst Catalog (Revised)
- Gamma-ray bursts from internal shocks in a relativistic wind: temporal and spectral properties
- Short Gamma-Ray Bursts with Extended Emission
- A Kilonova Following a Long-Duration Gamma-Ray Burst at 350 Mpc
- A nearby long gamma-ray burst from a merger of compact objects
- Flares in long and short Gamma-Ray Bursts: a common origin in a hyperaccreting accretion disk
- A long-duration gamma-ray burst with a peculiar origin
- JWST detection of heavy neutron capture elements in a compact object merger
- Unveiling the origin of X-ray flares in Gamma-Ray Bursts
- The structure of hydrodynamic -ray burst jets
- The origin and propagation of variability in the outflows of long duration gamma-ray bursts
- Self-organized criticality in X-ray flares of gamma-ray burst afterglows
- The case for a minute-long merger-driven gamma-ray burst from fast-cooling synchrotron emission
- A Peculiarly Short-duration Gamma-Ray Burst from Massive Star Core Collapse
- The peculiar short-duration GRB 200826A and its supernova
- Post-Launch Analysis of Swift's Gamma-Ray Burst Detection Sensitivity
- Probing the Cosmic Gamma-Ray Burst Rate with Trigger Simulations of the Swift Burst Alert Telescope
- On the Induced Gravitational Collapse of a Neutron Star to a Black Hole by a Type Ib/c Supernova
- Time Scales in Long GRBs
- The structure of weakly-magnetized -ray burst jets
- Temporal properties of gamma-ray bursts as signatures of jets from the central engine
- Modeling Gamma-Ray Burst X-Ray Flares within the Internal Shock Model
- Quiescent times in gamma-ray bursts: II. Dormant periods in the central engine?
- Self-Similar Temporal Behavior of Gamma-Ray Bursts
- Evidence for Chain Reaction in the Time Profiles of Gamma Ray Bursts
- GRB minimum variability timescale with Insight-HXMT and Swift: implications for progenitor models, dissipation physics and GRB classifications
- Individual power density spectra of Swift gamma-ray bursts
- SPH simulations of the induced gravitational collapse scenario of long gamma-ray bursts associated with supernovae
- A common stochastic process rules gamma-ray burst prompt emission and X-ray flares
- Average power density spectrum of Swift long gamma-ray bursts in the observer and in the source rest frames
- Intermittent hydrodynamic jets in collapsars do not produce GRBs
- Intermittent mildly magnetized jets as the source of GRBs
- Average power density spectrum of long GRBs detected with BeppoSAX/GRBM and with Fermi/GBM
- 21st Century Statistical and Computational Challenges in Astrophysics
- The Discovery of a New Instability in a Hyperaccretion Flow and its Implication for Gamma-ray Bursts
- Distribution of number of peaks within a long gamma-ray burst
- A Simple Law for the Average Time History of Gamma-Ray Bursts and Their Time Dilations
- Propagation of Relativistic, Hydrodynamic, Intermittent Jets in a Rotating, Collapsing GRB Progenitor Star
- Scale invariance in X-ray flares of gamma-ray bursts
- A proposed network of Gamma-ray Burst detectors on the Global Navigation Satellite System Galileo G2
- Survival of the Fittest: Numerical Modeling of Supernova 2014C