MAGIC upper limits on the very high energy emission from GRBs
Abstract
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).
Cite
@article{arxiv.astro-ph/0612548,
title = {MAGIC upper limits on the very high energy emission from GRBs},
author = {J. Albert and E. Aliu and H. Anderhub and P. Antoranz and A. Armada and C. Baixeras and J. A. Barrio and H. Bartko and D. Bastieri and J. Becker and W. Bednarek and K. Berger and C. Bigongiari and A. Biland and R. K. Bock and P. Bordas and V. Bosch-Ramon and T. Bretz and I. Britvitch and M. Camara and E. Carmona and A. Chilingarian and S. Ciprini and J. A. Coarasa and S. Commichau and J. L. Contreras and J. Cortina and M. T. Costado and V. Curtef and V. Danielyan and F. Dazzi and A. De Angelis and C. Delgado and R. de los Reyes and B. De Lotto and E. Domingo-Santamaria and D. Dorner and M. Doro and M. Errando and M. Fagiolini and D. Ferenc and E. Fernandez and R. Firpo and J. Flix and M. V. Fonseca and L. Font and M. Fuchs and N. Galante and R. Garcia-Lopez and M. Garczarczyk and M. Gaug and M. Giller and F. Goebel and D. Hakobyan and M. Hayashida and T. Hengstebeck and A. Herrero and D. Hohne and J. Hose and C. C. Hsu},
journal= {arXiv preprint arXiv:astro-ph/0612548},
year = {2009}
}
Comments
25 pages, 9 figures, final version accepted by ApJ. Changet title to "MAGIC upped limits on the VERY high energy emission from GRBs", re-organized chapter with description of observation, removed non necessaries figures, added plot of effective area depending on zenith angle, added an appendix explaining the upper limit calculation, added some references