Mass and spin constraint on black holes in long GRBs

TL;DR

This paper models the evolution of black hole mass and spin during a long gamma-ray burst, providing constraints on the black hole properties necessary to power such events.

Contribution

It introduces a model of accretion flow evolution that links black hole mass and spin to long GRB central engine requirements.

Findings

Black hole mass and spin thresholds for long GRB production

Evolutionary pathways of black holes during stellar collapse

Implications for GRB progenitor models

Abstract

We compute the evolution of a quasi-spherical, slowly rotating accretion flow around a black hole, whose mass and spin evolve adequately to the mass-energy transfer through the horizon. Our model is relevant for the central engine driving a long gamma ray burst, that originates from the collapse of a massive star. Our results show how much mass and spin a newly formed black hole should possess during collapsar to launch long GRB.