GRB 130603B: No Compelling Evidence for Neutron Star MergerReport as inadecuate

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Advances in Astronomy - Volume 2015 2015, Article ID 460293, 5 pages -

Research ArticlePhysics Department, Technion, 32000 Haifa, Israel

Received 22 September 2014; Accepted 3 February 2015

Academic Editor: WeiKang Zheng

Copyright © 2015 Shlomo Dado and Arnon Dar. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


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.

Author: Shlomo Dado and Arnon Dar



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