MAGIC CollaborationParedes i Poy, Josep MariaRibó Gomis, MarcBosch i Ramon, Valentí2020-02-142020-02-142010-06-110004-6361https://hdl.handle.net/2445/150317The blazar PG 1553+113 is a well known TeV gamma-ray emitter. In this paper, we determine its spectral energy distribution using simultaneous multi-frequency data in order to study its emission processes. An extensive campaign was carried out between March and April 2008, where optical, X-ray, high-energy (HE) gamma-ray, and very-high-energy (VHE) gamma-ray data were obtained with the KVA, Abastumani, REM, RossiXTE/ASM, AGILE and MAGIC telescopes, respectively. This is the first simultaneous broad-band (i.e., HE+VHE) gamma-ray observation, though AGILE did not detect the source. We combine data to derive source's spectral energy distribution and interpret its double peaked shape within the framework of a synchrotron self compton modelapplication/pdfeng(c) The European Southern Observatory (ESO), 2010Raigs gammaRaigs XGalàxiesGamma raysX-raysGalaxiesinfo:eu-repo/semantics/article5942012020-02-14info:eu-repo/semantics/openAccess