TY - GEN
T1 - The origin of long, short and low-luminosity gamma-ray bursts
AU - Piran, Tsvi
AU - Bromberg, Omer
AU - Nakar, Ehud
AU - Sari, Reem
N1 - Publisher Copyright:
© Rencontres du Vietnam All rights reserved.
PY - 2011
Y1 - 2011
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=85079534732&partnerID=8YFLogxK
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AN - SCOPUS:85079534732
T3 - Proceedings of the 10th International conference on Gravitation, Astrophysics and Cosmology, ICGAC 2011
SP - 47
EP - 56
BT - Proceedings of the 10th International conference on Gravitation, Astrophysics and Cosmology, ICGAC 2011
A2 - Triay, Roland
A2 - Tran Thanh Van, Jean
A2 - Celnikier, Ludwik M.
PB - The Gioi Publishers
T2 - 10th International conference on Gravitation, Astrophysics and Cosmology, ICGAC 2011
Y2 - 15 December 2011 through 21 December 2011
ER -