S18A0108abst

S18A0108

We propose to conduct rapid “Target of Opportunity” observations of gamma-ray burst (GRB) afterglows using the prompt alerts from the Swift, INTEGRAL, Fermi satellites and MAXI to pursue following goals: (1) Detect and characterize optical afterglow of short GRBs to study their connection with gravitational wave sources, (2) Detect and identify GRBs in the re-ionization era (6<z<20) (3) Examine the GRB-supernova connection using low-z GRBs (4) Probe the GRB environments and intergalactic medium through spectroscopy (5) Study GRBs with GeV/TeV γ-ray emission.
   Larger sample of short GRBs afterglow will be searched using HSC. Afterglow spectroscopy would be used to check their origin in neutrons star binary merger, the prospected gravitational wave events. The afterglow of long GRBs provide a unique probe for the re-ionization of the Universe and the environment of GRB sources in star-forming galaxies. GRBs with GeV/TeV emission detected by Fermi or CTA are useful for understanding the production mechanism of GRBs.

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