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2010 CFHT Users Meeting
November 16-18, 2010
ASIAA Auditorium, Taipei, Taiwan

Oral Presentation

Investigation of Origin of Optically Dark Gamma-ray Bursts with CFHT

Author(s): Kuiyun Huang (ASIAA), Yuji Urata (NCU), Myungshin Im (SNU), Minsung Jang (SNU) and the EAFON team

Presenter: Kuiyun Huang (ASIAA)

Gamma-ray bursts (GRBs) have been enigmatic phenomena for more than
four decades since its discovery. The recent observational studies are
still providing exciting discoveries such as the most distance object
(GRB080423 at z=8.2) in the Universe, ultra-high energy emission
(GeV) from the prompt phase, and delayed GeV afterglow! Furthermore,
due to the brightness, potential massive star progenitor and its
distance, GRBs is expected to be a powerful probe to explore POPIII
objects. One of the key open question is the orgin of the
optically/infrared dark GRBs. Observations by ground optical/NIR
telescopes and XRT and UVOT on-board the Swift satellites, revealed
most of GRBs have X-ray afterglows. However, more than 50% GRBs could
not detect their optical emission. So far, three possible suppositions
were proposed to explain the origin of optically dark GRBs. The
optically dark GRBs could be at high redshift, shielded by dusty
hosts, or be intrinsic faint. The results of our WIRCam and Magacam
observations for 11 GRBs reveal different properties among the three
categories and demonstrate the strategy of deep optical/NIR imaging is
essential to understand optically dark GRBs.

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