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Are low luminosity GRBs generated by relativistic jets?

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arxiv 1107.1346 v1 pith:7RWHGRMT submitted 2011-07-07 astro-ph.HE

Omer Bromberg , Ehud Nakar , Tsvi Piran This is my paper · ORCID
classification astro-ph.HE
keywords ll-grbsgamma-raylgrbsbreakoutburstscollapsardurationsgrbs
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Low luminosity gamma-ray bursts (ll-GRBs) constitute a sub-class of gamma-ray bursts (GRBs) that plays a central role in the GRB-supernova connection. While ll-GRBs differ from typical long GRBs (LGRBs) in many aspects, they also share some common features. Therefore, the question whether the gamma-ray emission of ll-GRBs and LGRBs has a common origin is of great interest. Here we address this question by testing whether ll-GRBs, like LGRBs according to the Collapsar model, can be generated by relativistic jets that punch holes in the envelopes of their progenitor stars. The collapsar model predicts that the durations of most observed bursts will be comparable to, or longer than, the time it takes the jets to breakout of the star. We calculate the jet breakout times of ll-GRBs and compare them to the observed durations. We find that there is a significant access of ll-GRBs with durations that are much shorter than the jet breakout time and that these are inconsistent with the Collapsar model. We conclude that the processes that dominate the gamma-ray emission of ll-GRBs and of LGRBs are most likely fundamentally different.

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Cited by 3 Pith papers

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  1. Multi-wavelength Constraints on the Transient EP250905a

    astro-ph.HE 2026-07 conditional novelty 5.0 of 10

    EP250905a is best explained as a mildly off-axis structured-jet afterglow at z=2.714, possibly weakly magnified by a foreground galaxy at z=0.374.

  2. Early Multiwavelength Observations of AT 2026fgk: The Luminous Afterglow to Sub-luminous GRB 260310A, Identified Independently of a Gamma-ray Trigger

    astro-ph.HE 2026-06 accept novelty 5.0 of 10

    First blind optical identification of a z=0.153 sub-luminous GRB afterglow with Ic-BL SN, yielding a volumetric rate consistent with on-axis high-luminosity long GRBs.

  3. Mapping Gamma-Ray Bursts: Distinguishing Progenitor Systems Through Machine Learning

    astro-ph.HE 2025-08 conditional novelty 4.0 of 10

    On a UMAP map of Fermi-GBM gamma-ray bursts, bursts with T90>100s appear clustered in a distinct head region, while radio-bright and radio-dark bursts do not separate.

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