The Macronova in GRB 050709 and the GRB-macronova connection

Zhi-Ping Jin, Kenta Hotokezaka, Xiang Li, Masaomi Tanaka, Paolo D’Avanzo, Yi-Zhong Fan (), Stefano Covino (), Da-Ming Wei and Tsvi Piran ()
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Zhi-Ping Jin: Key Laboratory of Dark Matter and Space Astronomy, Purple Mountain Observatory, Chinese Academy of Sciences
Kenta Hotokezaka: Racah Institute of Physics, The Hebrew University
Xiang Li: Key Laboratory of Dark Matter and Space Astronomy, Purple Mountain Observatory, Chinese Academy of Sciences
Masaomi Tanaka: National Astronomical Observatory of Japan
Paolo D’Avanzo: INAF/Brera Astronomical Observatory
Yi-Zhong Fan: Key Laboratory of Dark Matter and Space Astronomy, Purple Mountain Observatory, Chinese Academy of Sciences
Stefano Covino: INAF/Brera Astronomical Observatory
Da-Ming Wei: Key Laboratory of Dark Matter and Space Astronomy, Purple Mountain Observatory, Chinese Academy of Sciences
Tsvi Piran: Racah Institute of Physics, The Hebrew University

Nature Communications, 2016, vol. 7, issue 1, 1-8

Abstract: Abstract GRB 050709 was the first short Gamma-ray Burst (sGRB) with an identified optical counterpart. Here we report a reanalysis of the publicly available data of this event and the discovery of a Li-Paczynski macronova/kilonova that dominates the optical/infrared signal at t>2.5 days. Such a signal would arise from 0.05 r-process material launched by a compact binary merger. The implied mass ejection supports the suggestion that compact binary mergers are significant and possibly main sites of heavy r-process nucleosynthesis. Furthermore, we have reanalysed all afterglow data from nearby short and hybrid GRBs (shGRBs). A statistical study of shGRB/macronova connection reveals that macronova may have taken place in all these GRBs, although the fraction as low as 0.18 cannot be ruled out. The identification of two of the three macronova candidates in the I-band implies a more promising detection prospect for ground-based surveys.

Date: 2016
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DOI: 10.1038/ncomms12898

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