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J. Albert et al. 2007 ApJ 667 358 doi:10.1086/520761

MAGIC Upper Limits on the Very High Energy Emission from Gamma-Ray Bursts

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J. Albert1, E. Aliu2, H. Anderhub3, P. Antoranz4, A. Armada2, C. Baixeras5, J. A. Barrio4, H. Bartko6, D. Bastieri7, J. Becker8, W. Bednarek9, K. Berger1, C. Bigongiari7, A. Biland3, R. K. Bock6,7, P. Bordas10, V. Bosch-Ramon10, T. Bretz1, I. Britvitch3, M. Camara4, E. Carmona6, A. Chilingarian11, S. Ciprini12, J. A. Coarasa6, S. Commichau3, J. L. Contreras4, J. Cortina2, M. T. Costado13, V. Curtef8, V. Danielyan11, F. Dazzi7, A. De Angelis14, C. Delgado13, R. de los Reyes4, B. De Lotto14, E. Domingo-Santamaría2, D. Dorner1, M. Doro7, M. Errando2, M. Fagiolini15, D. Ferenc16, E. Fernández2, R. Firpo2, J. Flix2, M. V. Fonseca4, L. Font5, M. Fuchs6, N. Galante6, R. García-López13, M. Garczarczyk6, M. Gaug7, M. Giller9, F. Goebel6, D. Hakobyan11, M. Hayashida6, T. Hengstebeck17, A. Herrero13, D. Höhne1, J. Hose6, C. C. Hsu6, P. Jacon9, T. Jogler6, O. Kalekin17, R. Kosyra6, D. Kranich3, R. Kritzer1, A. Laille16, T. Lenisa14, P. Liebing6, E. Lindfors12, S. Lombardi7, F. Longo14, J. López2, M. López4, E. Lorenz3,6, P. Majumdar6, G. Maneva18, K. Mannheim1, O. Mansutti14, M. Mariotti7, M. Martínez2, D. Mazin6, C. Merck6, M. Meucci15, M. Meyer1, J. M. Miranda4, R. Mirzoyan6, S. Mizobuchi6, A. Moralejo2, K. Nilsson12, J. Ninkovic6, E. Oña-Wilhelmi2, N. Otte6, I. Oya4, D. Paneque6, M. Panniello13, R. Paoletti15, J. M. Paredes10, M. Pasanen12, D. Pascoli7, F. Pauss3, R. Pegna15, M. Persic14,19, L. Peruzzo7, A. Piccioli15, M. Poller1, E. Prandini7, N. Puchades2, A. Raymers11, W. Rhode8, M. Ribó10, J. Rico2, M. Rissi3, A. Robert5, S. Rügamer1, A. Saggion7, A. Sánchez5, P. Sartori7, V. Scalzotto7, V. Scapin7, R. Schmitt1, T. Schweizer6, M. Shayduk6,17, K. Shinozaki6, S. N. Shore20, N. Sidro2, A. Sillanpää12, D. Sobczynska9, A. Stamerra15, L. S. Stark3, L. Takalo12, P. Temnikov18, D. Tescaro2, M. Teshima6, N. Tonello6, D. F. Torres2,21, N. Turini15, H. Vankov18, V. Vitale14, R. M. Wagner6, T. Wibig9, W. Wittek6, R. Zanin2 and J. Zapatero5

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Abstract References Cited By

During its first data cycle, between 2005 and the beginning of 2006, the fast repositioning system of the MAGIC telescope allowed the observation of nine different gamma-ray bursts as possible sources of very high energy γ-rays. These observations were triggered by alerts from Swift, HETE-2, and INTEGRAL; they started as quickly as possible after the alerts and lasted for several minutes, with an energy threshold varying between 80 and 200 GeV, depending on 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 redshifts, 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.


Subject headings

gamma rays: bursts; gamma rays: observations


Dates

Issue 1 (2007 September 20)

Received 2006 December 14, accepted for publication 2007 May 22



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