Volume 493, Number 2, January II 2009
|Page(s)||467 - 469|
|Published online||20 November 2008|
MAGIC observations of PG 1553+113 during a multiwavelength campaign in July 2006
Universität Würzburg, 97074 Würzburg, Germany e-mail: firstname.lastname@example.org
2 IFAEnergies, Edifici Cn., 08193 Bellaterra, Spain
3 ETH Zürich, 8093 Hönggerberg, Switzerland
4 Universidad Complutense, 28040 Madrid, Spain
5 Universitat Autònoma de Barcelona, 08193 Bellaterra, Spain
6 Max-Planck-Institut für Physik, 80805 München, Germany
7 Università di Padova and INFN, 35131 Padova, Italy
8 Universität Dortmund, 44227 Dortmund, Germany
9 University of Łódź, 90236 Lodz, Poland
10 Tuorla Observatory, 21500 Piikkiö, Finland
11 Yerevan Physics Institute, 375036 Yerevan, Armenia
12 Inst. de Astrofisica de Canarias, 38200, La Laguna, Tenerife, Spain
13 Depto. de Astrofisica, Universidad, 38206 La Laguna, Tenerife, Spain
14 Università di Udine, and INFN Trieste, 33100 Udine, Italy
15 Università di Siena, and INFN Pisa, 53100 Siena, Italy
16 University of California, Davis, 95616-8677, USA
17 Humboldt-Universität zu Berlin, 12489 Berlin, Germany
18 Università di Trieste, and INFN Trieste, 34100 Trieste, Italy
19 Institute for Nuclear Research and Nuclear Energy, 1784 Sofia, Bulgaria
20 Università di Pisa, and INFN Pisa, 56126 Pisa, Italy
21 Institut de Ciències de l'Espai, 08193 Bellaterra, Spain
Accepted: 10 October 2008
The active galactic nucleus PG 1553+113 was observed by the MAGIC telescope in July 2006 during a multiwavelength campaign, in which telescopes in the optical, X-ray, and very high energies participated. Although the MAGIC data were affected by strong atmospheric absorption (calima), they were analyzed after applying a correction. In 8.5 h, a signal was detected with a significance of 5.0σ. The integral flux above 150 GeV was . By fitting the differential energy spectrum with a power law, a spectral index of was obtained.
Key words: gamma rays: observations / galaxies: active / galaxies: BL Lacertae objects: individual: PG 1553+113
© ESO, 2009
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