scholarly journals Hydrodynamic Collimation of Relativistic Outflows: Semianalytic Solutions and Application to Gamma‐Ray Bursts

2007 ◽  
Vol 671 (1) ◽  
pp. 678-688 ◽  
Author(s):  
Omer Bromberg ◽  
Amir Levinson
Keyword(s):  
Gamma Ray ◽  
Gamma Ray Bursts ◽  
Relativistic Outflows

scholarly journals Diffusive photospheres in gamma-ray bursts

2020 ◽  
Vol 494 (1) ◽  
pp. 1463-1469
Author(s):  
G V Vereshchagin ◽  
I A Siutsou
Keyword(s):  
Gamma Ray ◽  
Gamma Ray Bursts ◽  
Total Flux ◽  
Thermal Component ◽  
Radiative Diffusion ◽  
Relativistic Outflows ◽  
Photospheric Radius

ABSTRACT Photospheric emission may originate from relativistic outflows in two qualitatively different regimes: last scattering of photons inside the outflow at the photospheric radius or radiative diffusion to the boundary of the outflow. In this work, the measurement of temperature and flux of the thermal component in the early afterglows of several gamma-ray bursts along with the total flux in the prompt phase is used to determine initial radii of the outflow as well as its Lorentz factors. Results indicate that in some cases the outflow has relatively low Lorentz factors (Γ < 10), favouring cocoon interpretation, while in other cases Lorentz factors are larger (Γ > 10), indicating diffusive photospheric origin of the thermal component, associated with an ultrarelativistic outflow.

scholarly journals Radio studies of relativistic SN 2009bb

2013 ◽  
Vol 9 (S296) ◽  
pp. 395-396
Author(s):  
Alak Ray ◽  
Naveen Yadav ◽  
Sayan Chakraborti ◽  
Alicia Soderberg ◽  
Poonam Chandra
Keyword(s):  
Gamma Ray ◽  
Gamma Ray Bursts ◽  
Radio Observations ◽  
X Ray ◽  
Radio Studies ◽  
Relativistic Outflows

AbstractA local sub-population of type Ib/c supernovae (stripped envelope SNe) with mildly relativistic outflows have been detected as sub-energetic Gamma Ray Bursts (GRBs) or X-ray Flashes (XRFs) and as radio afterglows without detected GRB counterpart. SN 2009bb belongs to the last class of objects. The long term radio observations with (J)VLA and GMRT of this SN map the dynamics of the relativistic ejecta characteristic of Central Engines associated with GRBs. We present here GMRT observations of this SN from October 2009 onwards.

On the nature of cosmic gamma-ray bursts

1996 ◽  
Vol 166 (7) ◽  
pp. 743-762 ◽  
Author(s):  
B.I. Luchkov ◽  
I.G. Mitrofanov ◽  
I.L. Rozental'
Keyword(s):  
Gamma Ray ◽  
Gamma Ray Bursts

Cosmic gamma-ray bursts and soft gamma-repeaters — observations and modeling of extreme astrophysical phenomena (100th anniversary of the Ioffe Institute)

2018 ◽  
Vol 189 (08) ◽  
pp. 785-802 ◽  
Author(s):  
Rafail L. Aptekar ◽  
Andrei M. Bykov ◽  
Sergei V. Golenetskii ◽  
Dmitrii D. Frederiks ◽  
Dmitry S. Svinkin ◽  
...  
Keyword(s):  
Gamma Ray ◽  
100Th Anniversary ◽  
Gamma Ray Bursts ◽  
Soft Gamma Repeaters ◽  
Ioffe Institute ◽  
Astrophysical Phenomena
Sign in / Sign up

Export Citation Format

Share Document