2013ApJ...779L..25F -
Astrophys. J., 779, L25 (2013/December-3)
A supramassive magnetar central engine for GRB 130603B.
FAN Y.-Z., YU Y.-W., XU D., JIN Z.-P., WU X.-F., WEI D.-M. and ZHANG B.
Abstract (from CDS):
We show that the peculiar early optical emission and, in particular, the X-ray afterglow emission of the short-duration burst GRB 130603B can be explained by continuous energy injection into the blastwave from a supramassive magnetar central engine. The observed energetics and temporal/spectral properties of the late infrared bump (i.e., the "kilonova") are also found to be consistent with emission from the ejecta launched during a neutron star (NS)-NS merger and powered by a magnetar central engine. The isotropic-equivalent kinetic energies of both the gamma-ray burst (GRB) blastwave and the kilonova are approximately Ek∼ 1051 erg, consistent with being powered by a near-isotropic magnetar wind. However, this relatively small value requires that most of the initial rotational energy of the magnetar (∼a fewx1052 erg) is carried away by gravitational wave radiation. Our results suggest that (1) the progenitor of GRB 130603B was a NS-NS binary system, the merger product of which would have been a supramassive NS that lasted for about ∼1000 s; (2) the equation of state of the nuclear matter should be stiff enough to allow the survival of a long-lived supramassive NS; thus this suggested that the detection of the bright electromagnetic counterparts of gravitational wave triggers without short GRB associations is promising in the upcoming Advanced LIGO/VIRGO era.
Abstract Copyright:
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Journal keyword(s):
gamma rays: general - radiation mechanisms: non-thermal
Simbad objects:
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