Flux upper limit on gamma-ray emission by GRB 050713a from MAGIC telescope observations

© The American Astronomical Society. The construction of the MAGIC Telescope was mainly made possible by the support of the German Bundesministerium für Bildung und Forschung and Max-Planck-Gesellschaft, the Italian Istituto Nazionale de Fisica Nucleare, and the Spanish Comisión Interministerial de Ciencias y Tecnología, to whom goes
our grateful acknowledgement. We are grateful for all the hard work done by the GCN team, especially Scott Barthelmy, and to all the people of the Swift Science Center, who kindly provided us with data and the tools to analyze them. In particular, we are indebted to Professor Guido Chincarini, Abe Falcone, and Professor David Burrows from the Swift collaboration. We are also grateful to Nicola Omodei for fruitful discussions on the physics of GRBs. We would also like to thank the Instituto de Astrofísica de Canarias 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 grant 1P03D01028 from the Polish Ministerstwo Nauki i Informatyzacji.