Modelling the prompt optical emission of GRB 180325A: the evolution of a spike from the optical to gamma-rays
arXiv:2009.13614 · doi:10.3847/1538-4357/abcd3a
Abstract
The transition from prompt to the afterglow emission is one of the most exciting and least understood phases in gamma-ray bursts (GRBs). Correlations among optical, X-ray and gamma-ray emission in GRBs have been explored, to attempt to answer whether the earliest optical emission comes from internal and/or external shocks. We present optical photometric observations of GRB 180325A collected with the TAROT and RATIR ground-based telescopes. These observations show two strong optical flashes with separate peaks at s and s, followed by a temporally extended optical emission. We also present X-rays and gamma-ray observations of GRB 180325A, detected by the Burst Alert Telescope (BAT) and X-ray Telescope (XRT), on the Neil Gehrels Swift observatory, which both observed a narrow flash at s. We show that the prompt gamma- and X-ray early emission shares similar temporal and spectral features consistent with internal dissipation within the relativistic outflow (e.g. by internal shocks or magnetic reconnection), while the early optical flashes are likely generated by the reverse shock that decelerates the ejecta as it sweeps up the external medium.
Accepted for publication in ApJ
References in corpus (57)
- Gravitational Waves and Gamma-rays from a Binary Neutron Star Merger: GW170817 and GRB 170817A
- The Swift X-ray Telescope
- Collapsars - Gamma-Ray Bursts and Explosions in "Failed Supernovae"
- Spectra and Light Curves of Gamma-Ray Burst Afterglows
- Methods and results of an automatic analysis of a complete sample of Swift-XRT observations of GRBs
- The Burst Alert Telescope (BAT) on the Swift MIDEX Mission
- A very energetic supernova associated with the gamma-ray burst of 29 March 2003
- Astrometry.net: Blind astrometric calibration of arbitrary astronomical images
- The Physics of Gamma-Ray Bursts and Relativistic Jets
- Evidence for a Canonical GRB Afterglow Light Curve in the Swift/XRT Data
- Can internal shocks produce the variability in GRBs?
- Predictions for The Very Early Afterglow and The Optical Flash
- Afterglow Emission from Naked Gamma-Ray Bursts
- Efficient acceleration and radiation in Poynting flux powered GRB outflows
- GRB990123, The Optical Flash and The Fireball Model
- Hydrodynamic Time Scales and Temporal Structure of GRBs
- Light Curves of GRB Optical Flashes
- Long-lag, Wide-Pulse Gamma-Ray Bursts
- The First Survey of X-ray Flares from Gamma Ray Bursts Observed by Swift: Temporal Properties and Morphology
- Gamma-Ray Burst Peak Duration as a Function of Energy
- Testing the Curvature Effect and Internal Origin of Gamma-Ray Burst Prompt Emissions and X-ray Flares with Swift Data
- Reconciling observed GRB prompt spectra with synchrotron radiation ?
- Implications of Lag-Luminosity Relationship for Unified GRB Paradigms
- The First Survey of X-ray Flares from Gamma Ray Bursts Observed by Swift: Spectral Properties and Energetics
- Unveiling the origin of X-ray flares in Gamma-Ray Bursts
- Variabilities of Gamma-Ray Burst Afterglows: Long-acting Engine, Anisotropic Jet or Many Fluctuating Regions?
- Peak Luminosity-Spectral Lag Relation Caused by the Viewing Angle of the Collimated Gamma-Ray Bursts
- A Comprehensive Study of Gamma-Ray Burst Optical Emission: I. Flares and Early Shallow Decay Component
- Impulsive Acceleration of Strongly Magnetized Relativistic Flows
- Lag-luminosity relation in gamma-ray burst X-ray flares: a direct link to the prompt emission
- Curvature Effects in Gamma Ray Burst Colliding Shells
- Early Afterglow Emission from a Reverse Shock as a Diagnostic Tool for GRB Outflows
- Spectral lags and the energy dependence of pulse width in gamma-ray bursts: contributions from the relativistic curvature effect
- Gamma-Ray Burst Dynamics and Afterglow Radiation from Adaptive Mesh Refinement, Special Relativistic Hydrodynamic Simulations
- X-ray flare candidates in short gamma-ray bursts
- Correlated optical and X-ray flares in the afterglow of XRF 071031
- Flares in GRB afterglows from delayed magnetic dissipation
- Towards an understanding of GRB prompt emission mechanism: I. The origin of spectral lags
- Inverse Compton X-ray Flare from GRB Reverse Shock
- Continuous optical monitoring during the prompt emission of GRB 060111B
- Modeling the early multiwavelength emission in GRB130427A
- Realistic analytic model for the prompt and high latitude emission in GRBs
- Spectral evolution in gamma-ray bursts: predictions of the internal shock model and comparison to observations
- GRB Flares: UV/Optical Flaring (Paper I)
- GRB 060714: No Clear Dividing Line Between Prompt Emission and X-ray Flares
- GRB 110731A: Early afterglow in stellar wind powered by a magnetized outflow
- A detailed study of the optical attenuation of gamma-ray bursts in the Swift era
- Statistical Distributions of Optical Flares from Gamma-Ray Bursts
- Swift and Fermi observations of X-ray flares: the case of Late Internal Shock
- Reverse Shock Emission Revealed in Early Photometry in the Candidate Short GRB 180418A
- Probing Curvature Effects in the Fermi GRB 110920
- The 2175 Å extinction feature in the optical afterglow spectrum of GRB 180325A at z=2.25
- Pair-dominated GeV-optical flash in GRB 130427A
- The origin of the optical flashes: The case study of GRB 080319B and GRB 130427A
- Late Central Engine Activity in GRB 180205A
- GRB 180620A: Evidence for late-time energy injection
- Shock Dynamics In Relativistic Jets
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- A blast from the infant Universe: the very high-z GRB 210905A
- Modeling Gamma-ray burst Afterglow observations with an Off-axis Jet emission
- Fires in the deep: The luminosity distribution of early-time gamma-ray-burst afterglows in light of the Gamow Explorer sensitivity requirements
- GRB 191016A: The onset of the forward shock and evidence of late energy injection
- Detecting the early optical flashes of gamma-ray bursts with small telescope arrays
- GRB 180325A: dust grain-size distribution and interstellar iron nanoparticles contribution
- Predicting Multiwavelength Emission Associated with X-Ray Flares and Extended Emission of Gamma-Ray Bursts