The GRB early optical flashes from internal shocks: application to GRB990123, GRB041219a and GRB060111b

Abstract

With the successful launch of the Swift Gamma-Ray Burst Explorer, people expected the prompt optical flash like GRB990123 would be easily detected. However the fact that early optical flash have not been detected for a number of GRBs indicates the reverse shock must be suppressed. Here we explore the possibility that the optical flash may arise from the internal shock. We find that, under certain circumstance, the optical flash of GRB990123 and GRB060111b can really be explained by the internal shock. For GRB041219a, the prompt optical emission was correlated with the gamma-ray emission, we explain this feature also in the internal shock scenario, the optical emission is the low energy extension of the gamma-ray emission, and we can restrict its redshift $z\sim 0.2$. As for GRB050904, we have shown in previous paper that the optical flash was produced by synchrotron radiation and the X-ray flare was produced by the synchrotron-self-Compton mechanism. Therefore we conclude that the early optical flash of GRBs can usually come from the internal shock. Meanwhile since the condition to produce the optical flash is not easily satisfied, so the optical flash like GRB990123 should not be common in GRBs. In addition, we also discussed the synchrotron-self-Compton effect in the internal shock model, and find that for different values of parameters, there would be soft gamma-ray (100 KeV), hard gamma-ray (10 MeV) and GeV flare accompanying the optical flash. For GRB like GRB990123, a GeV flare with fluence about 10^{-8} erg cm^{-2} s^{-1} is expected, which may be detected by the GLAST satellite.

11 pages, minor revision, accepted by MNRAS

References in corpus (31)

• Spectra and Light Curves of Gamma-Ray Burst Afterglows
• Gamma-Ray Bursts and the Fireball Model
• Physical processes shaping GRB X-ray afterglow lightcurves: theoretical implications from the Swift XRT observations
• Observation of contemporaneous optical radiation from a gamma-ray burst
• On The Synchrotron Self-Compton Emission from Relativistic Shocks and Its Implications for Gamma-Ray Burst Afterglows
• 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 afterglow, the redshift, and the extreme energetics of the gamma-ray burst 990123
• GRB990123, The Optical Flash and The Fireball Model
• Gamma-ray burst early optical afterglows: implications for the initial Lorentz factor and the central engine
• GRB 990123: Reverse and Internal Shock Flashes and Late Afterglow
• Gamma-ray burst early afterglows: reverse shock emission from an arbitrarily magnetized ejecta
• Multiwavelength Observations of a Dramatic High Energy Flare in the Blazar 3C 279
• Late internal shock model for bright X-ray flares in Gamma-ray Burst afterglows and GRB 011121
• A Link between Prompt Optical and Prompt Gamma-Ray Emission in Gamma-Ray Bursts
• Probing the environment in Gamma-ray bursts: the case of an X-ray precursor, afterglow late onset and wind vs constant density profile in GRB011121 and GRB011211
• A contemporaneous infrared flash from a long gamma-ray burst: an echo from the central engine
• Optical Flash of GRB 990123: constraints on the physical parameter of the reverse shock
• Detection of a very bright optical flare from a gamma-ray burst at redshift 6.29
• The very early afterglow powered by the ultra-relativistic mildly magnetized outflows
• GeV-TeV and X-ray flares from gamma-ray bursts
• Prompt Optical Detection of GRB 050401 with ROTSE-IIIa
• The optical flare and afterglow light curve of GRB 050904 at redshift z=6.29
• Early optical-IR emission from GRB 041219a: neutron-rich internal shocks and a mildly magnetized external reverse shock
• Continuous optical monitoring during the prompt emission of GRB 060111B
• A Reverse-Shock Model for the Early Afterglow of GRB 050525A
• The afterglow of GRB021211: Another case of reverse shock emission
• Observations of the intense and ultra-long burst GRB041219a with the Germanium Spectrometer on INTEGRAL
• Prompt Ultraviolet-to-Soft-X-Ray Emission of Gamma-Ray Bursts: Application to GRB 031203?
• UV/Optical Emission Accompanying Gamma-ray Burst
• Infrared afterglow of GRB041219 as a result of reradiation on dust in a circumstellar cloud

Cited by in corpus (15)

• Gamma-Ray Bursts in the Swift Era
• Looking Into the Fireball: ROTSE-III and Swift Observations of Early GRB Afterglows
• A strong optical flare before the rising afterglow of GRB 080129
• Modeling Gamma-Ray Burst X-Ray Flares within the Internal Shock Model
• The Dark Side of ROTSE-III Prompt GRB Observations
• Prompt optical emission from residual collisions in GRB outflows
• GRB 090727 and gamma-ray bursts with early time optical emission
• Gamma-ray burst afterglows
• The initial Lorentz factors of fireballs inferred from the early X-ray data of SWIFT GRBs
• A multiwavelength study of Swift GRB 060111B constraining the origin of its prompt optical emission
• Reverse Shock Emission in Gamma-ray Bursts Revisited
• Photometric and Spectroscopic Observations of GRB 190106A: Emission from Reverse and Forward Shocks with Late-time Energy Injection
• A Unified Model of the Prompt Optical Emission of Gamma-Ray Bursts
• Quark-nova explosion inside a collapsar: application to Gamma Ray Bursts
• Synchrotron spectrum of fast cooling electrons in GRBs