Results 31 to 40 of about 249,127 (326)

GRB Redshift determination in the X-ray band [PDF]

open access: yes, 1999
If gamma-ray bursts originate in dense stellar forming regions, the interstellar material can imprint detectable absorption features on the observed X-ray spectrum.
.   +5 more
core   +2 more sources

Early optical observations of seven gamma-ray bursts in comparison to their gamma X-ray characteristics in the MSU MASTER Global Robotic Telescopes Net

open access: yesГеодинамика и тектонофизика, 2019
Seven gamma-ray bursts – GRB 130907A, GRB 140311B, GRB 140129B, GRB 160227A, GRB 120404A, GRB 110801A, and GRB 120811C were observed by the MSU MASTER (Mobile Astronomical System of TElescope Robots) Global Network.
V. M. Lipunov   +31 more
doaj   +1 more source

Relativistic Conic Beams and Spatial Distribution of Gamma-Ray Bursts [PDF]

open access: yes, 2000
We study the statistics of gamma-ray bursts, assuming that gamma-ray bursts are cosmological and they are beamed in the form of a conical jet with a large bulk Lorentz factor $\sim 100$.
Heon‐Young Chang, Insu Yi, Renaud N.
core   +6 more sources

Black Hole Accretion in Gamma Ray Bursts

open access: yesGalaxies, 2017
We study the structure and evolution of the hyperaccreting disks and outflows in the gamma ray bursts central engines. The torus around a stellar mass black hole is composed of free nucleons, Helium, electron-positron pairs, and is cooled by neutrino ...
Agnieszka Janiuk   +3 more
doaj   +1 more source

Jets in a Gamma-Ray Burst during Its Prompt Emission: Evolution of the Lorentz Factor

open access: yesThe Astrophysical Journal, 2023
Knowledge about the Lorentz factor and its evolution of relativistic jets in gamma-ray bursts (GRBs) is crucial to understand their physics. An exact value of the bulk Lorentz factor can be estimated based on a high-energy spectral cutoff, which may ...
Jing Li   +8 more
doaj   +1 more source

A kilonova following a long-duration gamma-ray burst at 350 Mpc [PDF]

open access: yesNature, 2022
Gamma-ray bursts (GRBs) are divided into two populations1,2; long GRBs that derive from the core collapse of massive stars (for example, ref. 3) and short GRBs that form in the merger of two compact objects4,5.
J. Rastinejad   +34 more
semanticscholar   +1 more source

The Origin of Low-redshift Event Rate Excess as Revealed by the Low-luminosity Gamma-Ray Bursts

open access: yesThe Astrophysical Journal, 2023
The relation between the event rate of long gamma-ray bursts and the star formation rate is still controversial, especially at the low-redshift end. Dong et al.
X. F. Dong   +4 more
doaj   +1 more source

MASTER prompt and follow-up GRB observations [PDF]

open access: yes, 2009
There are the results of gamma-ray bursts observations obtained using the MASTER robotic telescope in 2007 - 2009. We observed 20 error-boxes of gamma-ray bursts this period.The limits on their optical brightnesses have been derived.
Alexander Belinski   +17 more
core   +2 more sources

SHORT GAMMA-RAY BURSTS FROM THE MERGER OF TWO BLACK HOLES [PDF]

open access: yes, 2016
Short gamma-ray bursts (GRBs) are explosions of cosmic origins believed to be associated with the merger of two compact objects, either two neutron stars or a neutron star and a black hole (BH).
R. Perna, D. Lazzati, B. Giacomazzo
semanticscholar   +1 more source

Search for Gravitational-wave Signals Associated with Gamma-Ray Bursts during the Second Observing Run of Advanced LIGO and Advanced Virgo

open access: yesThe Astrophysical Journal, 2019
We present the results of targeted searches for gravitational-wave transients associated with gamma-ray bursts during the second observing run of Advanced LIGO and Advanced Virgo, which took place from 2016 November to 2017 August.
B. P. Abbott   +1197 more
doaj   +1 more source

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