Photometric and Spectroscopic Observations of GRB 140629A

Abstract

We present our optical photometric and spectroscopical observations of GRB 140629A. A redshift of $z=2.275\pm 0.043$ is measured through the metal absorption lines in our spectroscopic data. Using our photometric data and multiple observational data observed with other telescopes, we show that its optical light curve is well interpreted with the standard forward shock models in the thin shell case. Its optical-X-ray afterglow spectrum is jointly fitted with a single power-law function, yielding a photon index of $-1.90\pm 0.05$. The optical extinction and neutral hydrogen absorption of the GRB host galaxy are negligible. The fit to the light curve with the standard models shows that the ambient density is $60\pm 9$ cm${}^{-3}$ and the GRB radiating efficiency is as low as $\sim 0.24\%$, likely indicating a baryonic-dominated ejecta of this GRB. This burst agrees well with the $L_{\mathrm{p},\mathrm{iso}}-E_p^{{}^{\prime }}-{\Gamma }_0$ relation, but confidently violates those empirical relations involving geometric corrections (or jet break time). This gives rise to an issue of possible selection effect on these relations since the jet opening angle of this GRB is extremely narrow (0.04 rad).

arXiv commentApJ accepted, 6 figures, 3 tables

References in corpus (73)

• Maps of Dust IR Emission for Use in Estimation of Reddening and CMBR Foregrounds
• 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
• Gamma-Ray Bursts and the Fireball Model
• The Sixth Data Release of the Sloan Digital Sky Survey
• Gamma-Ray Bursts
• Beaming in Gamma-Ray Bursts: Evidence for a Standard Energy Reservoir
• Physical processes shaping GRB X-ray afterglow lightcurves: theoretical implications from the Swift XRT observations
• The Physics of Gamma-Ray Bursts and Relativistic Jets
• An online repository of Swift/XRT light curves of GRBs
• Evidence for a Canonical GRB Afterglow Light Curve in the Swift/XRT Data
• Gamma-Ray Bursts: Progress, Problems & Prospects
• The Dynamics and Light Curves of Beamed Gamma Ray Burst Afterglows
• The collimation--corrected GRB energies correlate with the peak energy of their $\nu F_{\nu }$ spectrum
• Can internal shocks produce the variability in GRBs?
• Predictions for The Very Early Afterglow and The Optical Flash
• Gamma-ray bursts from internal shocks in a relativistic wind: temporal and spectral properties
• Physical parameters of GRB 970508 and GRB 971214 from their afterglow synchrotron emission
• The early X-ray emission from GRBs
• GRB Energetics and the GRB Hubble Diagram: Promises and Limitations
• The Afterglows of Swift-era Gamma-Ray Bursts. I. Comparing pre-Swift and Swift era Long/Soft (Type II) GRB Optical Afterglows
• Optical and Radio Observations of the Afterglow from GRB990510: Evidence for a Jet
• A Comprehensive Analysis of the Swift/XRT Data: II. Diverse Physical Origins of the Shallow Decay Segment
• Model-Independent Multi-Variable Gamma-Ray Burst Luminosity Indicator and Its Possible Cosmological Implications
• A Complete Reference of the Analytical Synchrotron External Shock Models of Gamma-Ray Bursts
• Constraining GRB Initial Lorentz Factor with the Afterglow Onset Feature and Discovery of a Tight Gamma_0-E_iso Correlation
• A Study of the Afterglows of Four GRBs: Constraining the Explosion and Fireball Model
• GRB efficiency and Possible Physical Processes Shaping the Early Afterglow
• Constraining ${\Omega }_M$ and Dark Energy with Gamma-Ray Bursts
• Testing the Curvature Effect and Internal Origin of Gamma-Ray Burst Prompt Emissions and X-ray Flares with Swift Data
• Gamma Ray Bursts: new rulers to measure the Universe
• A Comprehensive Analysis of Swift/XRT Data: III. Jet Break Candidates in X-ray and Optical Afterglow Lightcurves
• Evidence for chromatic X-ray light-curve breaks in Swift GRB afterglows and their theoretical implications
• Gamma-Ray Burst Afterglows: Effects of Radiative Corrections and Nonuniformity of the Surrounding Medium
• Magnetic Fields In Relativistic Collisionless Shocks
• A comprehensive analysis of Swift/XRT data: I. Apparent spectral evolution of GRB X-ray tails
• Gamma-ray bursts with continuous energy injection and their afterglow signature
• The Xinglong 2.16-m Telescope: Current Instruments and Scientific Projects
• How Bad/Good Are the External Forward Shock Afterglow Models of Gamma-Ray Bursts?
• A Comprehensive Study of Gamma-Ray Burst Optical Emission: I. Flares and Early Shallow Decay Component
• Gamma-ray Burst Energetics
• A statistical study of gamma-ray burst afterglows measured by the Swift Ultra-violet Optical Telescope
• Rebrightening of XRF 030723: further evidence for a two-component jet in gamma-ray burst
• A Comprehensive Analysis of Fermi Gamma-ray Burst Data: III. Energy-Dependent T90 Distributions of GBM GRBs and Instrumental Selection Effect on Duration Classification
• A Comprehensive Study of Gamma-Ray Burst Optical Emission: II. Afterglow Onset and Late Re-Brightening Components
• Power Density Spectra of Gamma-Ray Bursts in the Internal Shock Model
• Gamma-ray Burst Cosmology
• Smooth Light Curves from a Bumpy Ride: Relativistic Blast Wave Encounters a Density Jump
• On the Optical Light Curves of Afterglows from Jetted Gamma-ray Burst Ejecta: Effects of Parameters
• The Onset of Gamma-Ray Burst Afterglow
• Early Afterglows of Gamma-Ray Bursts in a Stratified Medium with a Power-Law Density Distribution
• Constraining GRB Emission Physics with Extensive Early-Time, Multiband Follow-up
• Internal Energy Dissipation of Gamma-Ray Bursts Observed with Swift: Precursors, Prompt Gamma-rays, Extended emission and Late X-ray Flares
• Phenomenology of Reverse-Shock Emission in the Optical Afterglows of Gamma Ray Bursts
• Optical afterglows of Gamma-Ray Bursts: peaks, plateaus, and possibilities
• GRB 090426: Discovery of a jet break in a short burst afterglow
• The distribution of equivalent widths in long GRB afterglow spectra
• A Comprehensive Analysis of Swift/XRT Data: IV. Single Power-Law Decaying Lightcurves vs. Canonical Lightcurves and Implications for a Unified Origin of X-rays
• Probing the Nature of High-z Short GRB 090426 with Its Early Optical and X-ray Afterglows
• Optical and X-Ray Observations of GRB 060526: A Complex Afterglow Consistent with An Achromatic Jet Break
• A morphological analysis of gamma-ray burst early optical afterglows
• A Tight $L_{\mathrm{p},\mathrm{iso}}-E_{\mathrm{p}}^{\prime }-{\Gamma }_0$ Correlation of Gamma-Ray Bursts
• Models for Achromatic Light-Curve Breaks in GRB Afterglows: Jets, Structured Outflows, and Energy Injection
• Photosphere emission in the X-Ray Flares of Swift Gamma-Ray Bursts and Implications for the Fireball Properties
• GRB Flares: UV/Optical Flaring (Paper I)
• Temporal Variation in Excited Fe^+ Near a GRB Afterglow
• UVES/VLT high resolution absorption spectroscopy of the GRB080330 afterglow: a study of the GRB host galaxy and intervening absorbers
• A Comprehensive Study of Gamma-Ray Burst Optical Emission: III. Brightness Distributions and Luminosity Functions of Optical Afterglows
• Very Bright Prompt and Reverse Shock Emission of GRB 140512A
• The History of GRB Outflows: Ejection Lorentz Factor and Radiation Location of X-Ray Flares
• A GRB Follow-up System at the Xinglong Observatory and Detection of the High-Redshift GRB 060927
• Multi-Wavelength Observations of GRB 111228A and Implications for the Fireball and its environment
• Optical light curve of GRB 121011A: a textbook for the onset of GRB afterglow in a mixture of ISM and wind-type medium

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