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Flux reconstruction for the NIR camera CAGIRE at the focus of the Colibr\'i telescope

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arxiv 2209.00386 v1 pith:JHHLCB5T submitted 2022-09-01 astro-ph.IM

Alix Nouvel de la Flèche , Jean-Luc Atteia , Hervé Valentin , Marie Larrieu , Jérémie Boy , Olivier Gravrand , Olivier Boulade , Jean-Claude Clemens
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Aurélia Secroun Eric Kajfasz Olivier Llido Stéphane Basa François Dolon Johan Floriot Simona Lombardo Adrien Lamoure Laurent Rubaldo Bruno Fieque Julien Roumegoux Hervé Geoffray Alan M. Watson William H. Lee Nathaniel Butler
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keywords cagirefluxcameracolibrrampreceivedtelescopeaccumulating
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CAGIRE is the near infrared camera of the Colibr\'i robotic telescope, designed for the follow-up of SVOM alerts. It is based on the ALFA 2k x 2k detector, from the LYNRED French Company, operating in "Up the Ramp" mode. An observation consists in a series of short (1-2 minutes) exposures during which the pixels are read out every 1.3 second, while continuously accumulating charges proportionally to the received flux. We discuss here the preprocessing of CAGIRE data and a method that can be used to recover the flux received by each pixel from the slope of the ramp.

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