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

GRB 130603B: No Compelling Evidence For Neutron Star Merger