The origin of long, short and low-luminosity gamma-ray bursts

Tsvi Piran*, Omer Bromberg, Ehud Nakar, Reem Sari

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

The origin of Gamma-Ray Bursts is one of the most interesting puzzles in recent astronomy. During the last decade a consensus formed that long GRBs (LGRBs) arise from the collapse of massive stars and that short GRBs (SGRBs) have a different origin, most likely neutron star mergers. A key ingredient of the Collapsar model that explains how the collapse of massive stars produces a GRB is the emergence of a relativistic jet that penetrates the stellar envelope. The condition that the emerging jet penetrates the envelope poses strong constraints on the system [1]. Using these constraints we show that: (i) Low luminosity GRBs llGRBs, a sub population of GRBs with a very low luminosities (and other peculiar properties: single peaked, smooth and soft) cannot be formed by Collapsars [2]. They have a different origin (most likely a shock breakout). (ii) On the other hand regular LGRBs must be formed by Collapsars [3]. (iii) While for BATSE the dividing duration between Collapsars and non-Collapsar is indeed at ∼ 2 sec, the dividing duration is different for other GRBs detectors [4]. In particular most Swift bursts longer than 0.7 sec are of a Collapsar origin. This last results requires a revision of many conclusions concerning the origin of Swift SGRBs which were based on the classical 2 sec limit.

Original languageAmerican English
Title of host publicationProceedings of the 10th International conference on Gravitation, Astrophysics and Cosmology, ICGAC 2011
EditorsRoland Triay, Jean Tran Thanh Van, Ludwik M. Celnikier
PublisherThe Gioi Publishers
Pages47-56
Number of pages10
ISBN (Electronic)6047706193, 9786047706198
StatePublished - 2011
Event10th International conference on Gravitation, Astrophysics and Cosmology, ICGAC 2011 - Quy Nhon, Viet Nam
Duration: 15 Dec 201121 Dec 2011

Publication series

NameProceedings of the 10th International conference on Gravitation, Astrophysics and Cosmology, ICGAC 2011

Conference

Conference10th International conference on Gravitation, Astrophysics and Cosmology, ICGAC 2011
Country/TerritoryViet Nam
CityQuy Nhon
Period15/12/1121/12/11

Bibliographical note

Publisher Copyright:
© Rencontres du Vietnam All rights reserved.

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