Polarization and light curve variability: the "patchy shell" model

Abstract

Recent advances in early detection and detailed monitoring of GRB afterglows have revealed variability in some afterglow light curves. One of the leading models for this behavior is the patchy shell model. This model attributes the variability to random angular fluctuations in the relativistic jet energy. These an-axisymmetric fluctuations should also impose variations in the degree and angle of polarization that are correlated to the light curve variability. In this letter we present a solution of the light curve and polarization resulting from a given spectrum of energy fluctuations. We compare light curves produced using this solution to the variable light curve of GRB 021004 and we show that the main features in both the light curve and the polarization fluctuations are very well reproduced by this model. We use our results to draw constraints on the characteristics of the energy fluctuations that might have been present in GRB 021004.

10 pages, 2 figures, Final version to appear in ApJL

References in corpus (31)

• Spectra and Light Curves of Gamma-Ray Burst Afterglows
• Beaming in Gamma-Ray Bursts: Evidence for a Standard Energy Reservoir
• Theories of Gamma-Ray Bursts
• Refreshed Shocks and Afterglow Longevity in GRB
• Impulsive and Varying Injection in GRB Afterglows
• The Evolution of a Structured Relativistic Jet and GRB Afterglow Light-Curves
• Linear Polarization and Proper Motion in The Afterglow of Beamed GRBs
• Gamma-ray Bursts - A Puzzle Being Resolved
• The afterglow of GRB 021004: surfing on density waves
• Linear Polarization in Gamma-Ray Bursts: The Case for an Ordered Magnetic Field
• Some Observational Consequences of GRB Shock Models
• Polarization lightcurves and position angle variation of beamed gamma-ray bursts
• GRB 021004: Reverse Shock Emission
• Energetics and Luminosity Function of Gamma-ray Bursts
• The Most Probable Cause for the High Gamma-Ray Polarization in GRB 021206
• The Observed Size and Shape of GRB Afterglow
• Variability in GRB Afterglows and GRB 021004
• Spectropolarimetry of the Type Ic SN 2002ap in M74: More Evidence for Asymmetric Core Collapse
• Optical Photometry of GRB 021004: The First Month
• GRB 021004: a Massive Progenitor Star Surrounded by Shells
• Implications of the $\gamma$-ray Polarization of GRB 021206
• Variability of GRB Afterglows Due to Interstellar Turbulence
• Strongly Polarized Optical Afterglows of Gamma-Ray Bursts
• The unusual optical afterglow of the gamma-ray burst GRB 021004: Color changes and short-time-scale variability
• Variable polarization in the optical afterglow of GRB 021004
• Intrinsic and dust-induced polarization in gamma-ray burst afterglows: the case of GRB 021004
• Broadband Modeling of GRB 021004
• The Spectroscopic Variability of GRB 021004
• Modeling Fluctuations in the GRB-Afterglow Light Curves
• Wind-Interaction Models for the Early Afterglows of Gamma-Ray Bursts: The Case of GRB 021004
• Discovery of a short plateau phase in the early evolution of a gamma-ray burst afterglow

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• X-ray flare candidates in short gamma-ray bursts
• Polarization in the prompt emission of gamma-ray bursts and their afterglows
• Constraining the magnetic field structure in collisionless relativistic shocks with a radio afterglow polarization upper limit in GW170817
• ALMA Detection of a Linearly Polarized Reverse Shock in GRB 190114C
• GRB 091208B: First Detection of the Optical Polarization in Early Forward Shock Emission of a Gamma-Ray Burst Afterglow
• Energy Injection Episodes in Gamma Ray Bursts: The Light Curves and Polarization Properties of GRB 021004
• Shallow Decay of Early X-ray Afterglows from Inhomogeneous Gamma-Ray Burst Jets
• Weibel Filament Decay and Thermalization in Collisionless Shocks and Gamma-Ray Burst Afterglows
• On the jet structure and magnetic field configuration of GRB 020813
• Gamma-Ray Bursts: Polarization of Afterglows from Two-Component Jets
• Gamma-Ray Bursts as Sources of Strong Magnetic Fields
• GRB 060714: No Clear Dividing Line Between Prompt Emission and X-ray Flares
• The Rapidly Flaring Afterglow of the Very Bright and Energetic GRB 070125
• PROMPT Observations of the Early-Time Optical Afterglow of GRB 060607A
• The luminous host galaxy, faint supernova and rapid afterglow rebrightening of GRB 100418A
• Temporal Evolution of Prompt GRB Polarization
• Probing GRB environments with time variability: ULTRASPEC fast imaging of GRB 080210
• GRB 070518: A Gamma-ray Burst with Optically Dim Luminosity
• The long-active afterglow of GRB 210204A: Detection of the most delayed flares in a Gamma-Ray Burst
• Polarization of GRB Prompt Emission and its Application to POLAR's Data
• Coherence scale of magnetic fields generated in early-time forward shocks of GRBs
• The Signature of Refreshed Shocks in the of Afterglow of GRB030329
• Modeling the Linear Polarization of GRB Afterglows Across the Electromagnetic Spectrum
• Radio linear polarization of GRB afterglows: Instrumental Systematics in ALMA observations of GRB 171205A
• Evolution of perturbed accelerating relativistic shock waves
• HETE-2 Observations of the X-Ray Flash XRF 040916