Results 21 to 30 of about 8,426 (297)

The Jet Opening Angle and Event Rate Distributions of Short Gamma-Ray Bursts from Late-time X-Ray Afterglows

open access: yesThe Astrophysical Journal, 2023
We present a comprehensive study of 29 short gamma-ray bursts (SGRBs) observed ≈0.8−60 days postburst using Chandra and XMM-Newton. We provide the inferred distributions of the SGRB jet opening angles and true event rates to compare against neutron star ...
A. Rouco Escorial   +16 more
doaj   +1 more source

A mass model for estimating the gamma ray background of the Burst and Transient Source Experiment [PDF]

open access: yesAstronomy & Astrophysics, 2003
Orbiting x-ray and gamma ray instruments are subject to large background count rates due to local particle fluxes in the space environment. The ability of an instrument to make calibrated measurements of the flux from a source of interest is highly dependent on accurately determining the background level.
S. E. Shaw   +7 more
openaire   +2 more sources

Sensitivity of the Cherenkov Telescope Array to the gamma-ray emission from neutrino sources detected by IceCube [PDF]

open access: yes
Gamma-ray observations of the astrophysical neutrino sources are fundamentally important for understanding the underlying neutrino production mechanism. We investigate the Cherenkov Telescope Array (CTA) ability to detect the very-high-energy (VHE) gamma-
Caroff, Sami   +499 more
core   +6 more sources

Discovery of a transient MeV range gamma-ray source

open access: yesThe Astrophysical Journal, 1995
The University of California, San Diego (UCSD)/MIT hard X-ray and gamma-ray instrument on the HEAO 1 surveyed the region near the Galactic center 3 times during its lifetime in 1977-1979. During the 1977 September-October scan, a gamma-ray source was detected south of the Galactic center. The source was below the threshold sensitivity in the spring and
M. S. Briggs   +3 more
openaire   +1 more source

Precise source location of the anomalous 1979 March 5 gamma-ray transient [PDF]

open access: yesThe Astrophysical Journal, 1982
Refinements in the source direction analysis of the observations of the unusual gamma ray transient are presented. The final results from the interplanetary gamma ray burst network produce a 0.1 arc sq. min. error box. It is nested inside the initially determined 2 arc sq min. source region. This smaller source location is within both the optical and X-
T. L. Cline   +9 more
openaire   +1 more source

Transient sources with LST-1: study of novae, supernovae, and gamma-ray bursts [PDF]

open access: yes
[eng] The branch of astrophysics that studies transient phenomena allows the exploration of astronomical sources that show temporal variability that can extend from a few fractions of a second to scales as long as tens of years. These transient events can give rise to a wide variety of phenomena observed throughout the electromagnetic spectrum. In some
Aguasca i Cabot, Arnau
core   +3 more sources

The Fermi Gamma-ray Burst Monitor: Results from the first two years [PDF]

open access: yes, 2011
In the first two years since the launch of the Fermi Observatory, the Gamma-ray Burst Monitor (GBM) has detected over 500 Gamma-Ray Bursts (GRBs), of which 18 were confidently detected by the Large Area Telescope (LAT) above 100 MeV.
BISSALDI, ELISABETTA   +2 more
core   +1 more source

The Fermi Gamma-Ray Burst Monitor: Results from the first year and spectral analysis of GRB 090323 and GRB 090328

open access: yes, 2010
In the first year since the launch of the Fermi Observatory, the Gamma-ray Burst Monitor (GBM) has detected over 250 gamma-ray bursts (GRBs). Besides GRBs, GBM has triggered on other transient sources, such as soft gamma-ray repeaters and terrestrial ...
The Fermi GBM Team, BISSALDI, ELISABETTA
core   +2 more sources

Hybrid Emission Modeling of GRB 221009A: Shedding Light on TeV Emission Origins in Long GRBs

open access: yesThe Astrophysical Journal, 2023
Observations of long-duration gamma-ray bursts (GRBs) with TeV emission during their afterglow have been on the rise. Recently, GRB 221009A, the most energetic GRB ever observed, was detected by the Large High Altitude Air Shower Observatory experiment ...
Hebzibha Isravel   +2 more
doaj   +1 more source

Variable optical/infrared counterpart to the transient gamma-ray source J0109+6134 [PDF]

open access: yesAstronomy & Astrophysics, 2014
Context. We investigate the optical/infrared counterpart to the flaring gamma-ray source J0109+6134, which is believed to be a blazar seen through the Galactic plane.Aims. The original aim of this work was to confirm the previously proposed optical counterpart by means of studying its temporal behaviour.
E. Fernández-Valenzuela   +4 more
openaire   +1 more source

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