18 Result(s)

Article

Gamma-Ray Bursts: Should cosmologists care?

Gamma-Ray Burst (GRB) locations are distributed isotropically on the sky, but the intensity distribution of the bursts seems clearly incompatible with spatial homogeneity. Of the scenarios that attempt to prov...

J. G. Laros in Astrophysics and Space Science (1996)

Article

VLA observations of GRB error boxes

Very Large Array (VLA) radio observations of precisely-located GRB error boxes have been performed to search for fading and quiescent emission associated with γ-ray bursts. These observations were made as quic...

D. M. Palmer, T. L. Cline, J. G. Laros, K. Hurley… in Astrophysics and Space Science (1995)

Article

The intrinsic luminosity of γ-ray bursts and their host galaxies

THE Burst and Transient Source Experiment (BATSE) on the Compton Gamma-Ray Observatory has shown that, although γ-ray bursts are distributed isotropically on the sky, there is an apparent dearth of weak events...

E. E. Fenimore, R. I. Epstein, C. Ho, R. W. Klebesadel, C. Lacey, J. G. Laros… in Nature (1993)

Article

The soft γ-ray burst GB790107

Nearly all of the known γ-ray bursts (GRBs), when observed over the energy range ∼30 keV to 1 MeV, have intensity spectra that can be described in terms of several-hundred-keV exponential functions. The Venera 11...

J. G. Laros, E. E. Fenimore, M. M. Fikani, R. W. Klebesadel, C. Barat, G. Chambon… in Nature (1986)

Article

GB841215, the fastest γ-ray burst?

In the 12 yr since the discovery of γ-ray bursts by Klebesadel et al.¹, several hundred of these enigmatic events have been observed and catalogued (see, for example, refs 2–5). Their time histories have exhibite...

J. G. Laros, E. E. Fenimore, M. M. Fikani, R. W. Klebesadel, M. van der Klis… in Nature (1985)

Article

Further comments on the KONUS catalog

J. G. Laros, W. D. Evans, E. E. Fenimore… in Astrophysics and Space Science (1983)

Article

Persistent X-ray emission from a γ-ray burst source

A quiescent X-ray source detected with the Einstein X-ray Observatory in a location consistent with that of an intense γ-ray burst^1–3 is shown here to be also consistent with the location of the 1928 optical tran...

J. E. Grindlay, T. Cline, U. D. Desai, B. J. Teegarden, G. Pizzichini… in Nature (1982)

Article

Comments on the gamma-ray burst catalog of Mazetset al. (1981a)

We have discovered a correlation between the Venera spacecraft locations and the gamma-ray burst positions reported in the KONUS catalog (Mazetset al., 1981a). The reason for the correlation is not clear, but it ...

J. G. Laros, W. D. Evans, E. E. Fenimore… in Astrophysics and Space Science (1982)

Article

γ-ray sources as comptonized X-ray sources

γ-ray burst spectra have often been fit by optically thin thermal bremsstrahlung. However, at the high temperatures implied by such fits (kT∼300 keV), the free–free cross-section is so much smaller than the Compt...

E. E. Fenimore, R. W. Klebesadel, J. G. Laros, R. E. Stockdale, S. R. Kane in Nature (1982)

Article

X-ray and optical observations of the November 19, 1978 Gamma-Ray Burst source region

G. Pizzichini, J. Danziger, P. Grosbø, M. Tarenghi, T. L. Cline… in Space Science Reviews (1981)

Article

The LASL gamma-ray burst astronomy program

Gamma-ray burst observations performed by LASL began with the identification and initial report of the phenomenon from data acquired by the Vela satellites. The Vela instruments have recorded responses to 73 g...

R. W. Klebesadel, W. D. Evans, J. G. Laros in Astrophysics and Space Science (1981)

Article

Gamma-burst observations from the Pioneer Venus Orbiter

The LASL Pioneer Venus Orbiter Gamma Burst Detector (OGBD) is a vital element in the long base-line array of similar instruments intended to precisely locate sources of gamma-ray bursts. Results of early obser...

W. D. Evans, E. E. Fenimore, R. W. Klebesadel… in Astrophysics and Space Science (1981)

Article

Spectral evolution of the 5 March 1979 γ burst

The γ burst¹ of 5 March 1979 was observed by nine experiments^2–6 widely spaced on an interplanetary scale allowing an accurate position for a γ-burst source to be determined^2,6 for the first time. Spectral observ...

E. E. Fenimore, W. D. Evans, R. W. Klebesadel, J. G. Laros, J. Terrell in Nature (1981)

Article

γ-Ray burst observations from the UCB/LASL experiment on ISEE-3

Since the discovery of the intense bursts of γ rays by Klebesadel et al.¹ in 1973, little progress has been made in the identification of the sources of the bursts. The initial observations provided directions to...

W. D. Evans, R. W. Klebesadel, J. G. Laros, J. Terrell, S. R. Kane in Nature (1980)

Article

Periodicity of the γ-ray transient event of 5 March 1979

An unusual γ-ray burst event was observed on 5 March 1979 by nine different spacecraft^1–5. The position of the event has been accurately determined^1,2 as α = 5h 25.95 min, δ = −66°07.1′ (epoch 1950.0), coincident...

J. Terrell, W. D. Evans, R. W. Klebesadel, J. G. Laros in Nature (1980)

Article

A probable 1970 hard X-ray outburst by 4U0041 + 32

During a balloon test flight on 4 February 1970, an engineering model of the UCSD Cosmic X-ray Experiment, later flown on the OSO 7 satellite, observed what was apparently an unknown high-latitude X-ray source...

J. G. Laros, Wm A. Wheaton in Nature (1980)

Article

Preliminary results from Solrad 11 γ-burst detectors

WE present here temporal and 0.2–2 MeV spectral data from two γ bursts observed on 12 June and 16 August 1976, by detectors on the Solrad 11A and 11B satellites. The 12 June burst showed evidence for structure...

J. G. LAROS, W. D. EVANS, R. W. KLEBESADEL, R. A. OLSON, R. E. SPALDING in Nature (1977)