  Near infrared (NIR) flare/rebrightening in the afterglow of the short hard
gamma ray burst (SHB) 130603B measured with the Hubble Space Telescope (HST)
and an alleged late-time X-ray excess were interpreted as possible evidence of
a neutron-star merger origin of this SHB. However, the X-ray afterglow that was
measured with the Swift-XRT and Newton XMM have the canonical behaviour of a
synchrotron afterglow produced by a highly relativistic jet. The H-band flux
observed with HST 9.41 days after burst is that expected from the measured
late-time X-ray afterglow. A late-time flare/re-brightening of a NIR-Optical
afterglow of SHB can be produced by jet collision with an interstellar density
bump, or by a kilonova, but jet plus kilonova can be produced also by the
collapse of compact stars (neutron star, strange star, or quark star) to a more
compact object due to cooling, loss of angular momentum, or mass accretion.
