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arxiv: 1806.10624 · v2 · pith:6O5F747Cnew · submitted 2018-06-27 · 🌌 astro-ph.HE

A luminous blue kilonova and an off-axis jet from a compact binary merger at z=0.1341

E. Troja , G. Ryan , L. Piro , H. van Eerten , S. B. Cenko , Y. Yoon , S.-K. Lee , M. Im
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T. Sakamoto P. Gatkine A. Kutyrev S. Veilleux
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classification 🌌 astro-ph.HE
keywords gamma-rayshortafterglowdurationfaintkilonovaluminousoff-axis
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The recent discovery of a faint gamma-ray burst (GRB) coincident with the gravitational wave (GW) event GW 170817 revealed the existence of a population of low-luminosity short duration gamma-ray transients produced by neutron star mergers in the nearby Universe. These events could be routinely detected by existing gamma-ray monitors, yet previous observations failed to identify them without the aid of GW triggers. Here we show that GRB150101B was an analogue of GRB170817A located at a cosmological distance. GRB 150101B was a faint short duration GRB characterized by a bright optical counterpart and a long-lived X-ray afterglow. These properties are unusual for standard short GRBs and are instead consistent with an explosion viewed off-axis: the optical light is produced by a luminous kilonova component, while the observed X-rays trace the GRB afterglow viewed at an angle of ~13 degrees. Our findings suggest that these properties could be common among future electromagnetic counterparts of GW sources.

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Cited by 3 Pith papers

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    A simulation-based inference method with Gaussian process emulators trained on 1300 kilonova simulations recovers parameters accurately and rapidly while avoiding MCMC biases from likelihood misspecification.

  3. Early Optical Follow-up of Gamma-Ray Bursts: The Critical Role of Robotic Telescopes

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