Magic upper limits on the very high energy emission from gamma-ray bursts



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Antoranz Canales, Pedro and Barrio Uña, Juan Abel and Contreras González, José Luis and Fonseca González, Mª Victoria and Miranda Pantoja, José Miguel and López Moya, Marcos (2007) Magic upper limits on the very high energy emission from gamma-ray bursts. Astrophysical journal, 667 (1 (Par). pp. 358-366. ISSN 0004-637X

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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 gamma-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.

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© The American Astronomical Society. The construction of the MAGIC telescope was mainly made possible by the support of the German BMBF and MPG, the Italian INFN, and the Spanish CICYT, to whom goes our grateful acknowledgment. We would also like to thank the IAC for the excellent working conditions at the Observatorio del Roque de los Muchachos in La Palma. This work was further supported by ETH Research Grant TH 34/04 3 and Polish MNiI Grant

Uncontrolled Keywords:GRB 050713A, Compton Emission, Long-Duration, TEV Emission, Afterglows, Spectra, Synchrotron, Component, Fireballs, Search.
Subjects:Sciences > Physics > Electronics
Sciences > Physics > Electricity
Sciences > Physics > Nuclear physics
ID Code:23760
Deposited On:02 Dec 2013 11:45
Last Modified:10 Dec 2018 14:58

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