What can we learn from "internal plateaus"? The peculiar afterglow of GRB 070110

Abstract

Context: The origin of GRBs' prompt emission is highly debated. Proposed scenarios involve dissipation processes above or below the photosphere of an ultra-relativistic outflow. Aims: We search for observational features that would favour one scenario over the others by constraining the dissipation radius, the outflow magnetization or by indicating the presence of shocks. Bursts showing peculiarities can emphasize the role of a specific physical ingredient, which becomes more apparent under certain circumstances. Methods: We study GRB 070110, which exhibited several remarkable features during its early afterglow: a very flat plateau terminated by an extremely steep drop and immediately followed by a bump. We model the plateau as photospheric emission from a long lasting outflow of moderate Lorentz factor ($\Gamma \sim 20$) which lags behind an ultra-relativistic ($\Gamma >100$) ejecta responsible for the prompt emission. We compute the dissipation of energy in the forward and reverse shocks resulting from this ejecta's deceleration by the external medium. Results: Photospheric emission from the long-lasting outflow can account for the plateau properties (luminosity and spectrum) assuming some dissipation takes place in the flow. The geometrical timescale at the photospheric radius is so short that the observed decline at the end of the plateau likely corresponds to the shut-down of the central engine. The following bump results from dissipated power in the reverse shock, which develops when the slower material catches up with the initially fast component, after it had been decelerated. Conclusions: Our interpretation suggests that the prompt phase resulted from dissipation above the photosphere while the plateau had a photospheric origin. If the bump is produced by the reverse shock, it implies an upper limit ($\sigma \lesssim 0.1$) on the magnetization of the slower material.

arXiv comment10 pages, 4 figures, accepted for publication in A&A

References in corpus (76)

• The Physics of Neutron Stars
• Unsteady Outflow Models for Cosmological Gamma-Ray Bursts
• Physical processes shaping GRB X-ray afterglow lightcurves: theoretical implications from the Swift XRT observations
• The Physics of Gamma-Ray Bursts and Relativistic Jets
• Detection of the Characteristic Pion-Decay Signature in Supernova Remnants
• The Internal-Collision-Induced Magnetic Reconnection and Turbulence (ICMART) Model of Gamma-Ray Bursts
• Gamma-ray Burst Afterglow with Continuous Energy Injection: Signature of a Highly-Magnetized Millisecond Pulsar
• The Shape of Spectral Breaks in GRB Afterglows
• Can internal shocks produce the variability in GRBs?
• On The Synchrotron Self-Compton Emission from Relativistic Shocks and Its Implications for Gamma-Ray Burst Afterglows
• Dissipative Photosphere Models of Gamma-ray Bursts and X-ray Flashes
• Steep Slopes and Preferred Breaks in GRB Spectra: the Role of Photospheres and Comptonization
• Gamma-ray bursts from internal shocks in a relativistic wind: temporal and spectral properties
• Efficient acceleration and radiation in Poynting flux powered GRB outflows
• Particle Acceleration in Relativistic Magnetized Collisionless Electron-Ion Shocks
• Collisional mechanism for GRB emission
• Relativistic Jets Shine through Shocks or Magnetic Reconnection?
• Swift observations of GRB 070110: an extraordinary X-ray afterglow powered by the central engine
• Detection of a Thermal Spectral Component in the Prompt Emission of GRB 100724B
• Low Frequency Spectra of Gamma-Ray Bursts
• A Reconnection Switch to Trigger Gamma-Ray Burst Jet Dissipation
• Klein-Nishina Effects on Optically Thin Synchrotron and Synchrotron Self-Compton Spectrum
• Acceleration of GRB outflows by Poynting flux dissipation
• Testing the Curvature Effect and Internal Origin of Gamma-Ray Burst Prompt Emissions and X-ray Flares with Swift Data
• Cooling Time Scales and Temporal Structure of Gamma-Ray Bursts
• Prompt GRB emission from gradual energy dissipation
• Reconciling observed GRB prompt spectra with synchrotron radiation ?
• GRB110721A: An extreme peak energy and signatures of the photosphere
• On the Nature of Nonthermal Radiation from Cosmological Gamma-Ray Bursters
• Magnetic Fields In Relativistic Collisionless Shocks
• Some Observational Consequences of GRB Shock Models
• Can X-ray emission powered by a spinning-down magnetar explain some GRB light curve features?
• Prompt high-energy emission from gamma-ray bursts in the internal shock model
• On the Mechanism of Gamma-Ray Burst Afterglows
• Prompt emission spectra from the photosphere of a GRB
• Energies of GRB blast waves and prompt efficiencies as implied by modeling of X-ray and GeV afterglows
• Radiative transfer in ultra-relativistic outflows
• Spectral and timing properties of a dissipative GRB photosphere
• Can the early X-ray afterglow of GRBs be explained by a contribution from the reverse shock?
• Prompt GRB spectra: detailed calculations and the effect of pair production
• On the Efficiency of Internal Shocks in Gamma-Ray Bursts
• Gamma-ray bursts from magnetized collisionally-heated jets
• Early Optical Afterglows from Wind-Type Gamma-Ray Bursts
• Non-Thermal emission from the photospheres of Gamma-Ray Burst outflows. I: High frequency tails
• Quasi-thermal Comptonization and gamma-ray bursts
• Regulation of the spectral peak in gamma-ray bursts
• The peak energy of dissipative GRB photospheres
• Spectra of Poynting-flux powered GRB outflows
• Peak energy clustering and efficiency in compact objects
• Optical Flash of GRB 990123: constraints on the physical parameter of the reverse shock
• A general scheme for modeling gamma-ray burst prompt emission
• A Revised Analysis of Gamma Ray Bursts' prompt efficiencies
• Constraints on the Synchrotron Emission Mechanism in GRBs
• An Analysis of Chandra Deep Follow-up GRBs: Implications for Off-Axis Jets
• On the magnetization of gamma-ray burst blast waves
• The role of newly born magnetars in gamma-ray burst X-ray afterglow emission: Energy injection and internal emission
• Properties of GRB Lightcurves from Magnetic Reconnection
• Prompt Gamma Ray Burst emission from gradual magnetic dissipation
• Clustering of LAT light curves: a clue to the origin of high-energy emission in Gamma-Ray Bursts
• The emission mechanism in magnetically dominated GRB outflows
• On the origin of >10 GeV photons in gamma-ray burst afterglows
• Braking Index of Isolated Pulsars
• Constraining the magnetic field in GRB relativistic collisionless shocks using radio data
• Prompt thermal emission in gamma-ray bursts
• Observational signatures of sub-photospheric radiation mediated shocks in the prompt phase of GRBs
• A Reverse-Shock Model for the Early Afterglow of GRB 050525A
• Reverse Shock Emission as a Probe of GRB Ejecta
• Gamma-Ray Bursts as Sources of Strong Magnetic Fields
• FERMI constraints on the high energy, ~1 GeV, emission of long GRBs
• GRB 090926A and Bright Late-time Fermi LAT GRB Afterglows
• Limits on the GeV Emission from Gamma-Ray Bursts
• Beaming of particles and synchrotron radiation in relativistic magnetic reconnection
• An External Shock Origin of GRB $\text{141028A}$
• GRBs from Magnetic Reconnection: Variability and Robustness of Lightcurves
• Accounting for the XRT early steep decay in models of the prompt GRB emission
• The radiative efficiency of relativistic jet and wind: A case study of GRB 070110

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• Magnetar central engines in gamma-ray busts follow the universal relation of accreting magnetic stars
• The Prompt Emission of Gamma-Ray Bursts from the Wind of Newborn Millisecond Magnetars: A Case Study of GRB 160804A
• To power the X-ray plateaus of gamma-ray bursts through larger amplitude electromagnetic waves
• Dynamics and emission of wind-powered afterglows of gamma-ray bursts: flares, plateaus and steep decays
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