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2019ApJS..245....1T - Astrophys. J., Suppl. Ser., 245, 1-1 (2019/November-0)

Statistical study of gamma-ray bursts with a plateau phase in the X-ray afterglow.


Abstract (from CDS):

A plateau phase in the X-ray afterglow is observed in a significant fraction of gamma-ray bursts (GRBs). Previously, a correlation among three key parameters concerning the plateau phase is found to exist, i.e., the end time of the plateau phase in the GRB rest frame (Ta), the corresponding X-ray luminosity at the end time (LX) and the isotropic energy of the prompt GRB (Eγ,iso). In this study, we systematically search through all the Swift GRBs with a plateau phase that occurred between 2005 May and 2018 August. We collect 174 GRBs, with redshifts available for all of them. For the whole sample, the correlation between LX, Ta, and Eγ,iso is confirmed, with the best-fit relation being LX∝Ta–1.01E_γ,iso_0.84. Such an updated three-parameter correlation still supports that the central leftover after GRBs is probably a millisecond magnetar. Note that short GRBs with durations less than 2 s in our sample also follow the same correlation, which hints that the merger production of two neutron stars could be a high-mass magnetar but not necessarily a black hole. Moreover, GRBs with an "internal" plateau (i.e., with a following decay index being generally smaller than -3) also obey this correlation. It further strengthens the idea that the internal plateau is due to the delayed collapse of a high-mass neutron star into a black hole. The updated three-parameter correlation indicates that GRBs with a plateau phase may act as a standard candle for cosmology study.

Abstract Copyright: © 2019. The American Astronomical Society. All rights reserved.

Journal keyword(s): gamma-ray burst: general - methods: statistical

Simbad objects: 183

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