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BEAMING IN GAMMA-RAY BURSTS: EVIDENCE FOR A STANDARD ENERGY RESERVOIR
We present a comprehensive sample of all gamma-ray burst (GRB) afterglows with known distances, and we derive their conical opening angles based on observed broadband breaks in their light curves.Expand
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The afterglow, the redshift, and the extreme energetics of the gamma-ray burst 990123
Afterglow, or long-lived emission, has now been detected from about a dozen well-positioned gamma-ray bursts. Distance determinations made by measuring optical emission lines from the host galaxy, orExpand
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CONTINUUM AND EMISSION-LINE STRENGTH RELATIONS FOR A LARGE ACTIVE GALACTIC NUCLEI SAMPLE
We report on the analysis of a large sample of 744 type 1 active galactic nuclei, including quasars and Seyfert 1 galaxies across the redshift from 0 z 5 and spanning nearly 6 orders of magnitude inExpand
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The Host Galaxy of GRB 990123
We present deep images of the field of GRB 990123 obtained in a broadband UV/visible bandpass with the Hubble Space Telescope (HST) and deep near-infrared images obtained with the Keck I 10 mExpand
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The Hamburg/SAO survey for emission-line galaxies. VI. The sixth list of 126 galaxies
We present the fourth list with results of the Hamburg/SAO Survey for Emission-Line Galaxies (HSS hereafter, SAO - Special Astrophysical Observatory, Russia). The list is a result of the follow-upExpand
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An infrared flash contemporaneous with the gamma-rays of GRB 041219a.
The explosion that results in a cosmic gamma-ray burst (GRB) is thought to produce emission from two physical processes: the central engine gives rise to the high-energy emission of the burst throughExpand
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A contemporaneous infrared flash from a long gamma-ray burst: an echo from the central engine
The explosion that results in a cosmic gamma-ray burst (GRB) is thought to produce emission from two physical processes -- the activity of the central engine gives rise to the high-energy emission ofExpand
Observations of DG Tauri with the Keck
We present the first science results from the Keck Interferometer, a direct-detection infrared interferometer utilizing the two 10-meter Keck telescopes. The instrument and system components areExpand
THE COSMIC GAMMA-RAY BURSTS a b
Cosmic γ-ray bursts are one of the great frontiers of astrophysics today. They are a playground of relativists and observers alike. They may teach us about the death of stars and the birth of blackExpand
01 07 53 5 v 1 2 7 Ju l 2 00 1 The GRB Host Galaxies and Redshifts ⋆
Observations of GRB host galaxies and their environments in general can provide valuable clues about the nature of progenitors. Bursts are associated with faint, R ∼ 25 mag, galaxies at cosmologicalExpand