0000000000268103

AUTHOR

B. L. Jensen

showing 2 related works from this author

Detection of GRB 060927 at z = 5.47: Implications for the Use of Gamma-Ray Bursts as Probes of the End of the Dark Ages

2007

We report on follow-up observations of the GRB 060927 using the ROTSE-IIIa telescope and a suite of larger aperture ground-based telescopes. An optical afterglow was detected 20 s after the burst, the earliest rest-frame detection of optical emission from any GRB. Spectroscopy performed with the VLT about 13 hours after the trigger shows a continuum break at lambda ~ 8070 A produced by neutral hydrogen absorption at z~5.6. We also detect an absorption line at 8158 A which we interpret as SiII at z=5.467. Hence, GRB 060927 is the second most distant GRB with a spectroscopically measured redshift. The shape of the red wing of the spectral break can be fitted by a damped Lyalpha profile with a…

Astrophysics::High Energy Astrophysical PhenomenaFOS: Physical sciencesAstrophysicsAstrophysics::Cosmology and Extragalactic AstrophysicsAstrophysics01 natural sciencesCosmology: ObservationsSpectral linelaw.inventionTelescopeCosmology: Observations; gamma rays: bursts (GRB 060927)law0103 physical sciences010303 astronomy & astrophysicsReionizationAstrophysics::Galaxy AstrophysicsPhysics010308 nuclear & particles physicsAstrophysics (astro-ph)Astronomy and AstrophysicsGalaxyRedshiftAfterglowQC Physics13. Climate actionSpace and Planetary ScienceDark Agesgamma rays: bursts(GRB 060927)Gamma-ray burstgamma rays: bursts (GRB 060927)Astrophysical Journal
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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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