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Gamma-Ray Burst Progenitors

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Figure

Fig. 1 High energy phase space for gamma-ray bursts, adapted from Levan et al. (2014a)
Fig. 2 The distribution of isotropic equivalent energy with redshift for long GRBs from Xu et al
Fig. 3 Host galaxy metallicitiesLeloudas et al.striking that the metallicities ofLGRBs appear significantlylower than for the SGRBs, orindeed the general galaxypopulation (Graham and Fruchter2013GRBs with apparent SNe appearto be somewhat lower still, andar
Fig. 4 The hardness-duration distribution of GRBs detected bylarger forfordistinguishing long and short GRBs at 50, 70 and 90 % confidence are also shown (where FNC is the fractionof non-collapsars), bursts below these lines are more likely to be collapsars
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J Nemiroff, A century of gamma ray burst models Comments Astrophys 17, 189 (1994)

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