0000000000902010

AUTHOR

Evert Rol

showing 3 related works from this author

GRB 030227: The first multiwavelength afterglow of an INTEGRAL GRB

2003

We present multiwavelength observations of a gamma-ray burst detected by INTEGRAL (GRB 030227) between 5.3 hours and ~1.7 days after the event. Here we report the discovery of a dim optical afterglow (OA) that would not have been detected by many previous searches due to its faintess (R~23). This OA was seen to decline following a power law decay with index Alpha_R= -0.95 +/- 0.16. The spectral index Beta_opt/NIR yielded -1.25 +/- 0.14. These values may be explained by a relativistic expansion of a fireball (with p = 2.0) in the cooling regime. We also find evidence for inverse Compton scattering in X-rays.

PhysicsSpectral indexBurstsAstrophysics (astro-ph)Gamma raysCompton scatteringbursts [gamma rays]FOS: Physical sciencesAstronomy and AstrophysicsAstrophysicsGamma rays ; Bursts ; Photometric ; Cosmology observationsPhotometricUNESCO::ASTRONOMÍA Y ASTROFÍSICAAstrophysicsCosmology observationsPower law:ASTRONOMÍA Y ASTROFÍSICA::Cosmología y cosmogonia [UNESCO]observations [cosmology]Afterglowphotometric [techniques]Space and Planetary ScienceAstronomy Astrophysics and CosmologyUNESCO::ASTRONOMÍA Y ASTROFÍSICA::Cosmología y cosmogoniaGamma-ray burst:ASTRONOMÍA Y ASTROFÍSICA [UNESCO]
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A tale of two GRB-SNe at a common redshift of z=0.54

2011

We present ground-based and HST optical observations of the optical transients (OTs) of long-duration Gamma Ray Bursts (GRBs) 060729 and 090618, both at a redshift of z = 0.54. For GRB 060729, bumps are seen in the optical light curves (LCs), and the late-time broadband spectral energy distributions (SEDs) of the OT resemble those of local type Ic supernovae (SNe). For GRB 090618, the dense sampling of our optical observations has allowed us to detect well-defined bumps in the optical LCs, as well as a change in colour, that are indicative of light coming from a core-collapse SN. The accompanying SNe for both events are individually compared with SN1998bw, a known GRB-supernova, and SN1994I…

PhysicsBrightnessAstrophysics::High Energy Astrophysical PhenomenaExtinction (astronomy)Astronomy and AstrophysicsContext (language use)Astrophysics::Cosmology and Extragalactic AstrophysicsAstrophysicsLight curveRedshiftAfterglowSupernovaSpace and Planetary ScienceAstrophysics::Solar and Stellar AstrophysicsGamma-ray burstAstrophysics::Galaxy AstrophysicsMonthly Notices of the Royal Astronomical Society
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GRB 061121: Broadband Spectral Evolution through the Prompt and Afterglow Phases of a Bright Burst

2007

Swift triggered on a precursor to the main burst of GRB 061121 (z=1.314), allowing observations to be made from the optical to gamma-ray bands. Many other telescopes, including Konus-Wind, XMM-Newton, ROTSE and the Faulkes Telescope North, also observed the burst. The gamma-ray, X-ray and UV/optical emission all showed a peak ~75s after the trigger, although the optical and X-ray afterglow components also appear early on - before, or during, the main peak. Spectral evolution was seen throughout the burst, with the prompt emission showing a clear positive correlation between brightness and hardness. The Spectral Energy Distribution (SED) of the prompt emission, stretching from 1eV up to 1MeV…

PhysicsBrightnessX-rays: individual (GRB 061121)Astrophysics::High Energy Astrophysical PhenomenaMolecular cloudAstrophysics (astro-ph)FOS: Physical sciencesAstronomy and AstrophysicsAstrophysics::Cosmology and Extragalactic AstrophysicsAstrophysicsRest frameAstrophysicsSpectral lineAfterglowlaw.inventionGamma Rays: BurstsTelescopeGamma Rays: Bursts; X-rays: individual (GRB 061121)Space and Planetary SciencelawSpectral energy distributionGamma-ray burstThe Astrophysical Journal
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