Optically Selected GRB Afterglows, a Real Time Analysis System at the CFHT

Frederic Malacrino (1) , Jean-Luc Atteia (1) , Michel Boer (2) , Alain Klotz (3) , John J. Kavelaars (4) , Jean-Charles Cuillandre (5)

1 LATT - Laboratoire d'Astrophysique de l'Observatoire Midi-Pyrénées
2 OHP - Observatoire de Haute-Provence
3 CESR - Centre d'étude spatiale des rayonnements
4 IHA-CNRC - Institut Herzberg d'astrophysique du Conseil national de recherches Canada
5 CFHT - Canada-France-Hawaii Telescope Corporation

We attempt to detect optical GRB afterglows on images taken by the Canada France Hawaii Telescope for the Very Wide survey, component of the Legacy Survey. To do so, a Real Time Analysis System called "Optically Selected GRB Afterglows" has been installed on a dedicated computer in Hawaii. This pipeline automatically and quickly analyzes Megacam images and extracts from them a list of variable objects which is displayed on a web page for validation by a member of the collaboration. The Very Wide survey covers 1200 square degrees down to i'=23.5. This paper briefly explain the RTAS process.

Mots clés: Gamma-ray burst

Domaines: Cosmologie et astrophysique extra-galactique [astro-ph.CO]

Frederic Malacrino, Jean-Luc Atteia, Michel Boer, Alain Klotz, John J. Kavelaars, et al.. Optically Selected GRB Afterglows, a Real Time Analysis System at the CFHT. 2006. ⟨hal-00016586⟩