Long-term variability of gamma-ray bursts

Radio studies of relativistic SN 2009bb

Proceedings of the International Astronomical Union ◽

10.1017/s174392131300999x ◽

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.

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THE INTERACTION BETWEEN GAMMA-RAY BURSTS AND THEIR ENVIRONMENT

Modern Physics Letters A ◽

10.1142/s0217732303012234 ◽

2003 ◽

Vol 18 (37) ◽

pp. 2611-2625

Author(s):

ROSALBA PERNA

Keyword(s):

Gamma Ray ◽

High Energy ◽

Gamma Ray Bursts ◽

Host Galaxies ◽

High Energy Astrophysics ◽

Wavelength Radiation ◽

Nearby Galaxies ◽

The Universe ◽

Shed Light

Gamma-ray Bursts (GRBs) are the most energetic and most relativistic phenomenon in the Universe. Understanding the nature of their progenitors is among the primary efforts of current research in high energy astrophysics, and their unmatched luminosity and other properties makes them ideal cosmological probes. This review summarizes the observational effects resulting from the interaction between the longer-wavelength radiation accompanying GRBs and their close environment. In particular, it discusses signatures that, in addition to providing powerful clues on the GRB progenitors, can also shed light on the physical characteristics, such as metallicity and dust content, of the GRB host galaxies. The last part of the article reviews the long-term signatures imprinted in the medium after a GRB explosion, particularly focusing on how we can identify GRB remnants in our own and nearby galaxies, and what we can learn from their identification.

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Long-Term Evolution of (Short) Gamma-Ray Burst Central Engines

International Astronomical Union Colloquium ◽

10.1017/s0252921100152194 ◽

2004 ◽

Vol 194 ◽

pp. 132-133

Author(s):

William H. Lee

Keyword(s):

Black Holes ◽

Neutron Star ◽

Accretion Disks ◽

Gamma Ray ◽

Dynamical Evolution ◽

Gamma Ray Bursts ◽

Term Evolution ◽

Star Binary ◽

Short Grbs

AbstractCosmological gamma ray bursts (GRBs) possibly originate from accretion disks around stellar mass black holes. These could be formed after the merger of a double neutron star or black hole-neutron star binary. The dynamical evolution of the disk is important if one wishes to relate characteristic timescales with the observed duration and variability. We show here the results of such a set of calculations, relevant for short GRBs.

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