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MAGIC upper limits on the very high energy emission from GRBs

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arxiv astro-ph/0612548 v2 pith:AZAZDEZG submitted 2006-12-19 astro-ph

J. Albert , E. Aliu , H. Anderhub , P. Antoranz , A. Armada , C. Baixeras , J. A. Barrio , H. Bartko
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D. Bastieri J. Becker W. Bednarek K. Berger C. Bigongiari A. Biland R. K. Bock P. Bordas V. Bosch-Ramon T. Bretz I. Britvitch M. Camara E. Carmona A. Chilingarian S. Ciprini J. A. Coarasa S. Commichau J. L. Contreras J. Cortina M.T. Costado V. Curtef V. Danielyan F. Dazzi A. De Angelis C. Delgado R. de los Reyes B. De Lotto E. Domingo-Santamaria D. Dorner M. Doro M. Errando M. Fagiolini D. Ferenc E. Fernandez R. Firpo J. Flix M. V. Fonseca L. Font M. Fuchs N. Galante R. Garcia-Lopez M. Garczarczyk M. Gaug M. Giller F. Goebel D. Hakobyan M. Hayashida T. Hengstebeck A. Herrero D. Hohne J. Hose C. C. Hsu et al. (MAGIC Collaboration: 84 additional authors not shown)
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The fast repositioning system of the MAGIC Telescope has allowed during its first data cycle, between 2005 and the beginning of year 2006, observing nine different GRBs as possible sources of very high energy gammas. These observations were triggered by alerts from Swift, HETE-II, and Integral; they started as fast as possible after the alerts and lasted for several minutes, with an energy threshold varying between 80 and 200 GeV, depending upon the zenith angle of the burst. No evidence for gamma signals was found, and upper limits for the flux were derived for all events, using the standard analysis chain of MAGIC. For the bursts with measured redshift, the upper limits are compatible with a power law extrapolation, when the intrinsic fluxes are evaluated taking into account the attenuation due to the scattering in the Metagalactic Radiation Field (MRF).

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