TY - JOUR A2 - Zheng, WeiKang AU - Dado, Shlomo AU - Dar, Arnon PY - 2015 DA - 2015/08/24 TI - GRB 130603B: No Compelling Evidence for Neutron Star Merger SP - 460293 VL - 2015 AB - The 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 SHBs. However, the X-ray afterglow that was measured with the Swift XRT and Newton XMM has 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. The late-time flare/rebrightening of the NIR-optical afterglow of SHB 130603B could have been produced also by jet collision with an interstellar density bump. Moreover, SHB plus a kilonova can be produced also by the collapse of a compact star (neutron star, strange star, or quark star) to a more compact object due to cooling, loss of angular momentum, or mass accretion. SN - 1687-7969 UR - https://doi.org/10.1155/2015/460293 DO - 10.1155/2015/460293 JF - Advances in Astronomy PB - Hindawi Publishing Corporation KW - ER -