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The Resolved Fraction of the Cosmic X-Ray Background
We present the X-ray source number counts in two energy bands (0.5-2 and 2-10 keV) from a very large source sample: we combine data of six different surveys, both shallow wide-field and deepExpand
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Afterglow light curves, viewing angle and the jet structure of γ-ray bursts
Gamma-ray bursts are often modelled as jet-like outflows directed towards the observer; the cone angle of the jet is then commonly inferred from the time at which there is a steepening in theExpand
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Evidence for supernova signatures in the spectrum of the late-time bump of the optical afterglow of GRB 021211
We present photometric and spectroscopic observations of the gamma-ray burst GRB 021211 obtained during the late stages of its afterglow. The light curve shows a rebrightening occurring ∼25 daysExpand
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The Rates of hypernovae and gamma-ray bursts: Implications for their progenitors
A critical comparison of estimates for the rates of hypernovae (HNe) and gamma-ray bursts (GRBs) is presented. Within the substantial uncertainties, the estimates are shown to be quite comparable andExpand
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Gamma-Ray Bursts: New Rulers to Measure the Universe
The best measure of the universe should be done using a standard "ruler" at any redshift. Type Ia supernovae (SN Ia) probe the universe up to z ~ 1.5, while the cosmic microwave background (CMB)Expand
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Off-axis emission of short γ-ray bursts and the detectability of electromagnetic counterparts of gravitational-wave-detected binary mergers
We present calculations of the wide angle emission of short-duration gamma-ray bursts from compact binary merger progenitors. Such events are expected to be localized by their gravitational waveExpand
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Internal shocks in the jets of radio-loud quasars
The central engine causing the production of jets in radio sources may work intermittently, accelerating shells of plasma with different mass, energy and velocity. Faster but later shells can thenExpand
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Clustering of the optical-afterglow luminosities of long gamma-ray bursts
Received 2005 Abstract. We studied the optical afterglows of the 24 pre-SWIFT Gamma-Ray Bursts with known spectroscopic redshift and published estimates of the optical extinction in the source frame.Expand
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NON-THERMAL EMISSION FROM THE PHOTOSPHERES OF GAMMA-RAY BURST OUTFLOWS. I. HIGH-FREQUENCY TAILS
We study the spectrum of high-frequency radiation emerging from mildly dissipative photospheres of long-duration gamma-ray burst outflows. Building on the results of recent numerical investigations,Expand
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Constraints on the emission mechanisms of gamma‐ray bursts
ABSTRACT If the emission of gamma–ray bursts were due to the synchrotron process in the stan-dard internal shock scenario, then the typical observed spectrum should have a slopeF ν ∝ν −1/2 , whichExpand
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