A MAD Model for Gamma-Ray Burst Variability

Lloyd-Ronning, Nicole Marie; Dolence, Joshua C.; Fryer, Christopher Lee

doi:10.1093/mnras/stw1366

Title: A MAD Model for Gamma-Ray Burst Variability

Journal Article · Thu Jun 09 00:00:00 EDT 2016 · Monthly Notices of the Royal Astronomical Society

DOI:https://doi.org/10.1093/mnras/stw1366· OSTI ID:1338734

Lloyd-Ronning, Nicole Marie ^[1]; Dolence, Joshua C. ^[1]; Fryer, Christopher Lee ^[1]

Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

Here we present a model for the temporal variability of long gamma-ray bursts during the prompt phase (the highly variable first 100 seconds or so), in the context of a magnet- ically arrested disk (MAD) around a black hole. In this state, sufficient magnetic flux is held on to the black hole such that it stalls the accretion near the inner region of the disk. The system transitions in and out of the MAD state, which we relate to the vari- able luminosity of the GRB during the prompt phase, with a characteristic timescale defined by the free fall time in the region over which the accretion is arrested. We present simple analytic estimates of the relevant energetics and timescales, and com- pare them to gamma-ray burst observations. In particular, we show how this model can reproduce the characteristic one second time scale that emerges from various analyses of the prompt emission light curve. Finally, we also discuss how our model can accommodate the potentially physically important correlation between a burst quiescent time and the duration of its subsequent pulse (Ramirez-Ruiz & Merloni 2001).

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Research Organization:: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: AC52-06NA25396

OSTI ID:: 1338734

Report Number(s):: LA-UR-15-29635

Journal Information:: Monthly Notices of the Royal Astronomical Society, Vol. 461, Issue 1; ISSN 0035-8711

Publisher:: Royal Astronomical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 12 works

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