Visit ASIAA Homepage Registration Deadline: August 15, 2019 (Taiwan Time)
Science with the Submillimeter Array: Present and Future
November 4(Mon)-5(Tue), 2019
ASIAA, Taipei, Taiwan

Poster Presentation

Fermi LAT detected GRB 160623A with bright afterglow ~Double-Jet component

Author(s): Wei Ju Chen (NCU), Yuji Urata (NCU), Kuiyun Huang (CYCU) et al.

Presenter: Wei Ju Chen (IANCU)

We present multi-wave length observations of Fermi/LAT detected GRB160623A using SMA, AMI, and Swift/XRT afterglow monitoring. The SMA observations provided the bright submm afterglow finding and long-term monitoring. The temporal evolution and spectral properties in radio band were consistent with the standard forward synchrotron radiation model. The forward shock modeling, using a two-dimensional relativistic hydrodynamic jet simulation, was also determined by the reasonable burst explosion and synchrotron radiation parameters for the submm afterglow. One of notable features was that jet opening of ~30 deg, which is the widest values among all GRB afterglows. Although X-ray afterglow is also consistent with the forward shock model, temporal and spectral indexes required much narrower jet opening angles (smaller than 2.4 deg). This analysis indicates that existence of double component jets. Since collapser model of GRBs expect cocoon around jet, the finding of double component jet may be an observational evidence of existence of cocoon.

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