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astro-ph2000
Comment on ``Violation of the Greisen-Zatsepin-Kuzmin Cutoff: A Tempest in a (Magnetic) Teapot? Why Cosmic Ray Energies above eV May Not Require New Physics''
Arnon Dar
In a recent letter [1] with the same title, Farrar and Piran offered an explanation for the near isotropy of the arrival directions [2] of ultrahigh energy cosmic rays (UHECRs) and…
astro-ph2000
The late afterglow and host galaxy of GRB 990712
Jens Hjorth, Stephen Holland, Frederic Courbin +3
We present deep HST imaging, as well as ground-based imaging and spectroscopy, of the optical afterglow associated with the long-duration gamma-ray burst GRB 990712 and its host ga…
astro-ph2000
SGRs and AXPs - Magnetars or Young Quark Stars ?
Arnon Dar, Alvaro DeRújula
Recent measurements of the spin-down rates of soft gamma ray repeaters (SGRs) and anomalous X-ray pulsars (AXPs) have been interpreted as evidence that these objects are ``magnetar…