GRB 021004 modelled by multiple energy injections

Abstract

GRB 021004 is one of the best sampled gamma-ray bursts (GRB) to date, although the nature of its light curve is still being debated. Here we present a large amount (107) of new optical, near-infrared (NIR) and millimetre observations, ranging from 2 hours to more than a year after the burst. Fitting the multiband data to a model based on multiple energy injections suggests that at least 7 refreshed shocks took place during the evolution of the afterglow, implying a total energy release (collimated within an angle of 1.8 deg) of ~ 8x10^51 erg. Analysis of the late photometry reveals that the GRB 021004 host is a low extinction (Av ~ 0.1) starburst galaxy with M_B ~ -22.0.

9 pages, 5 figures, accepted for publication in A&Ax

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• Broadband Modeling of GRB 021004
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• Modeling the Optical Afterglow of GRB 030329
• Photometry and spectroscopy of GRB 060526: A detailed study of the afterglow and host galaxy of a z=3.2 gamma-ray burst
• High Quality Early Time Light Curves of GRB 060206: Implications for Gamma Ray Burst Environments and Energetics
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• GRB 021004: Tomography of a gamma-ray burst progenitor and its host galaxy
• Energy Injection in GRB Afterglow Models
• Afterglow Light Curves and Broken Power Laws: A Statistical Study
• Extensive multiband study of the X-ray rich GRB 050408. A likely off-axis event with an intense energy injection
• The Rapidly Flaring Afterglow of the Very Bright and Energetic GRB 070125
• Long GRBs are metallicity-biased tracers of star formation: evidence from host galaxies and redshift distribution
• GROND coverage of the main peak of Gamma-Ray Burst 130925A
• PROMPT Observations of the Early-Time Optical Afterglow of GRB 060607A
• The luminous host galaxy, faint supernova and rapid afterglow rebrightening of GRB 100418A
• Fall back accretion and energy injections in gamma-ray bursts
• A Large Catalogue of Multi-wavelength GRB Afterglows I: Color Evolution And Its Physical Implication
• ALMA Submillimeter Continuum Imaging of the Host Galaxies of GRB021004 and GRB080607
• Physics of the GRB 030328 afterglow and its environment
• The variable X-ray light curve of GRB 050713A: the case of refreshed shocks
• Revealing the Jet Structure of GRB 030329 with High Resolution Multicolor Photometry
• Extragalactic Millimeter Transients in the Era of Next Generation CMB Surveys
• GRB 070125 and the environments of spectral-line poor afterglow absorbers
• Fires in the deep: The luminosity distribution of early-time gamma-ray-burst afterglows in light of the Gamow Explorer sensitivity requirements
• Investigating the impact of optical selection effects on observed rest frame prompt GRB properties
• GRB 051028: an intrinsically faint GRB at high redshift?
• A two-step energy injection explanation for the rebrightenings of the multi-band afterglow of GRB 081029
• The shallow-decay phase in both optical and x-ray afterglows of Swift GRB 090529A: Energy injection into a wind-type medium?
• Exploring Damped Lyman-$\alpha$ System Host Galaxies using Gamma-ray Bursts
• Late Engine Activity of GRB 161017A Revealed by Early Optical Observations
• Study of Faint Galaxies in the Field of GRB 021004
• Varying linear polarisation in the dust-free GRB 210610B
• Diagnosing Circumburst Environment with Multiband Gamma-Ray Burst Radio Afterglows
• Multi-epoch afterglow rebrightenings in GRB 250129A: Evidence for successive shock interactions
• Low-energy electrons in GRB afterglow models
• On the Variability of Gamma-Ray Burst Afterglows - A Possibility of a Transition to Nonrelativistic Motion