Quiescent Burst Evidence for Two Distinct GRB Emission Components
arXiv:astro-ph/0403360 · doi:10.1086/421060
Abstract
We have identified two quiescent GRBs (bursts having two or more widely-separated distinct emission episodes) in which the post-quiescent emission exhibits distinctly different characteristics than the pre-quiescent emission. In these two cases (BATSE GRBs 960530 and 980125), the second emission episode has a longer lag, a smoother morphology, and softer spectral evolution than the first episode. Although the pre-quiescent emission satisfies the standard internal shock paradigm, we demonstrate that the post-quiescent emission is more consistent with external shocks. We infer that some observed soft, faint, long-lag GRBs are external shocks in which the internal shock signature is not observed. We further note that the peak luminosity ratio between quiescent episodes is not in agreement with the ratio predicated by the lag vs. peak luminosity relationship. We briefly discuss these observations in terms of current collapsar jet models.
19 pages, 4 figures, 2 tables, accepted for publication in The Astrophysical Journal
References in corpus (32)
- Beaming in Gamma-Ray Bursts: Evidence for a Standard Energy Reservoir
- Can internal shocks produce the variability in GRBs?
- Connection Between Energy-dependent Lags And Peak Luminosity In Gamma-ray Bursts
- The Fourth BATSE Gamma-Ray Burst Catalog (Revised)
- Gamma-ray bursts from internal shocks in a relativistic wind: temporal and spectral properties
- Relativistic Jets in Collapsars
- Viewing Angle and Environment Effects in GRB: Sources of Afterglow Diversity
- GRB990123, The Optical Flash and The Fireball Model
- Variability in GRBs - A Clue
- Events in the life of a cocoon surrounding a light, collapsar jet
- GRB 990123: Reverse and Internal Shock Flashes and Late Afterglow
- Expanding Relativistic Shells and Gamma-Ray Burst Temporal Structure
- A Possible Cepheid-Like Luminosity Estimator for the Long Gamma-Ray Bursts
- Linear Polarization and Proper Motion in The Afterglow of Beamed GRBs
- Implications of Lag-Luminosity Relationship for Unified GRB Paradigms
- Quasi-universal Gaussian jets: a unified picture for gamma-ray bursts and X-ray flashes
- Cosmological GRBs: Internal vs. External Shocks
- Gamma-Ray Burst Spectral Evolution Through Crosscorrelations of Discriminator Light Curves
- Pulse Width Evolution in GRBs: Evidence for Internal Shocks
- Energetics and Luminosity Function of Gamma-ray Bursts
- BATSE Observations of Gamma-Ray Burst Tails
- 3D Simulations of Relativistic Precessing Jets Probing the Structure of Superluminal Sources
- Quiescent times in gamma-ray bursts: II. Dormant periods in the central engine?
- Quiescent times in gamma-ray bursts: I. An observed correlation between the durations of subsequent emission episodes
- Evidence for an Early High-Energy Afterglow Observed with BATSE from GRB980923
- Spectral Lags of Gamma-Ray Burst From Ginga and BATSE
- GRBs Light Curves - Another Clue on the Inner Engine
- GRB990123: Evidence that the Gamma Rays Come from a Central Engine
- Gamma-Ray Burst and Relativistic Shells: The Surface Filling Factor
- The First Two Host Galaxies of X-ray Flashes: XRF 011030 and XRF 020427
- Was GRB 990123 a unique optical flash?
- Temporal Evolution of the Pulse Width in GRBs
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- Correlations Between Lag, Luminosity, and Duration in Gamma-ray Burst Pulses
- Spectral lags and the energy dependence of pulse width in gamma-ray bursts: contributions from the relativistic curvature effect
- On the Spectral Lags of the Short Gamma-Ray Bursts
- Distribution of Spectral Lags in Gamma Ray Bursts
- Spectral-Temporal Simulations of Internal Dissipation Models of Gamma-Ray Bursts
- Global characteristics of GRBs observed with INTEGRAL and the inferred large population of low-luminosity GRBs
- Observations of the intense and ultra-long burst GRB041219a with the Germanium Spectrometer on INTEGRAL
- A Further Test of Lorentz Violation from the Rest-Frame Spectral Lags of Gamma-Ray Bursts
- Quiescent times in Gamma-Ray-Bursts: hints of a dormant inner engine
- Relative spectral lag: an new redshift indicator to measure the cosmos with gamma-ray bursts
- Broadband lightcurve characteristics of GRBs 980425 and 060218 and comparison with long-lag, wide-pulse GRBs
- Dependence of Temporal Properties on Energy in Long-Lag, Wide-Pulse Gamma-Ray Bursts
- A Simple Two-Parameter Characterization of Gamma-Ray Burst Time Histories
- GRB 090618: different pulse temporal and spectral characteristics within a burst
- High energy time lags of Gamma Ray Bursts
- A Concept of Assessment of LIV Tests with THESEUS Using the Gamma-Ray Bursts Detected by Fermi/GBM