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

Poster Presentation

The SNDice Photometric Calibration System @ CFHT

Author(s): Nicolas Regnault, for the SNDice collaboration

Presenter: Nicolas Regnault (LPNHE - CNRS - Universites Paris 6 & 7)

Since the advent of large supernova surveys, photometric calibration
has become a dominant contribution to the systematic error budgets.
Traditional techniques, relying on the observation of
spectrophotometric standard stars have allowed one to reach a
precision slightly better than 1% in the visible, and 2% in the near
infrared. These techniques are ultimately limited by the knowledge of
the SED of the fundamental spectrophotometric standards, such as Vega
or BD +17 4708. Also, large volumes of observations are needed to
study and map the photometric response of the imagers.

Over the last few years, several instrumental calibration projects
have been initiated by several collaborations (SDSS, ESSENCE,
SNLS). One goal is to be able to monitor routinely the response of the
instrument using a calibrated light source. The ultimate goal is to
anchor the photometric calibration of the imager on a lab standard
(namely a NIST photodiode) instead of a stellar standard.

We present the SNDice (Supernova Direct Calibration Experiment)
calibration system currently installed and operated at CFHT. We will
discuss the status of the analysis and the many applications of the
SNDice dataset.

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