gamma-ray bursts

Rapidly Detecting Extincted Bursts with KAIT and PAIRITEL

Ground-based robotic telescopes have proven essential in the first 6 months of Swift operation. The robotic optical 0.7m Katzman Automatic Imaging Telescope (KAIT) and the robotic infra-red 1.3m Peters Automated Infrared Imaging Telescope (PAIRITEL) …

Energetics and the GRB Hubble Diagram

The energy release in prompt γ- and X-rays is a fundamental parameter in the study of the explosion mechanism and the central engines of GRBs. Though the apparent standardizability of GRB energetics have lead some to suggest that GRBs might be useful …

The afterglows of gamma-ray bursts

Gamma-ray burst astronomy has undergone a revolution in the last three years, spurred by the discovery of fading long-wavelength counterparts. We now know that at least the long duration GRBs lie at cosmological distances with estimated …

The afterglows of gamma-ray bursts

Gamma-ray burst astronomy has undergone a revolution in the last three years, spurred by the discovery of fading long-wavelength counterparts. We now know that at least the long-duration GRBs lie at cosmological distances with estimated …

The afterglows of gamma-ray bursts

Gamma-ray burst astronomy has undergone a revolution in the last three years, spurred by the discovery of fading long-wavelength counterparts. We now know that at least the long duration GRBs lie at cosmological distances with estimated …

Gamma-ray bursts from stellar remnants: probing the Universe at high redshift

A gamma-ray burst (GRB) releases an amount of energy similar to that of a supernova explosion, which combined with its rapid variability suggests an origin related to neutron stars or black holes. Since these compact stellar remnants form from the …

Using STIS to find gamma-ray burst redshifts

A recent spectrum of the optical afterglow of GRB 970508 suggests that gamma-ray bursts (GRBs) are cosmological in origin, and it is of crucial importance to derive an accurate distance to each burst. If GRBs occur near their host galaxies …

The decay of optical emission from the γ-ray burst GRB 970228.

The optical counterpart of the γ-ray burst GRB 970228 appears to be a transient point source embedded in a region of extended nebulosity, the latter having been tentatively identified as a high-redshift galaxy. This would seem to favour models that …

The corrected log N-log fluence distribution of cosmological γ-ray bursts

Recent analysis of relativistically expanding shells of cosmological γ-ray bursts has shown that if the bursts are cosmological, then most likely total energy (E$_0$) is standard and not peak luminosity (L$_0$). Assuming a flat Friedmann cosmology …

The corrected log N-log fluence distribution of cosmological γ-ray bursts

Recent analysis of relativistically expanding shells of cosmological γ-ray bursts has shown that if the bursts are cosmological, then most likely total energy (E$_0$) is standard and not peak luminosity (L$_0$). Assuming a flat Friedmann cosmology …