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

Oral Presentation

Ultra-bright optical transient and related host galaxy identification by CFHT/MegaCam

Author(s): Y. Urata (NCU), K.Y. Huang (ASIAA), and PS1 transient team

Presenter: Yuji Urata (NCU)

The modern synoptic optical imaging surveys such as PanSTARRS are
making new mysterious transients discoveries. The preliminary results
are remarkable, and newly discovered transients are revolutionizing
our knowledge of stellar explosions. Ultra-bright optical transients,
associated with faint and, presumably, metal-poor host galaxies are
the most spectacular recent discoveries. These transients share the
common properties of high optical luminosities (peak absolute
magnitudes -21 to -23, blue colors, a lack of H or He spectral
features. The luminosity is 3-4 magnitudes brighter than that of
supernova component associated with GRBs. Thanks to the brightness,
this transient make them prime targets for high redshift
studies. Indeed Pan-STARRS's finding of the redshift of z=1.2 is
already impressive. We report the follow-up observation with
CFHT/WIRCam. Further effective candidate selection with Pan-STARRS,
we have created two kind of deeper image sets using CFHT/MegaCAM for
checking the host galaxy properties and for confirmation of previous
activities. We have also built our own in-house Virtual Observatory
at NCU, Taiwan. This allows us to obtain cut-out images and catalogs
quickly for newly discovered orphan transients by Pan-STARRS. Our
Virtual Observatory is working well, and lead to identify the
host-less SN-Ia event and so on.

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