A4 Refereed article in a conference publication
MAGIC observations of variable very-high-energy gamma-ray emission from PKS1510-089 during May 2015 outburst
Authors: Julian Sitarek, Josefa Becerra González, Vandad Fallah Ramazani, Elina Lindfors, Giovanna Pedaletti, Fabrizio Tavecchio , Monica Vazquez Acosta, Stefan Larsson, Kiran Baliyan, Navpreet Kaur, Sameer, Svetlana Jorstad, Claudia Raiteri
Conference name: International Cosmic Ray Conference ICRC
Publisher: Sissa Medialab Srl
Publication year: 2017
Journal: POS Proceedings of Science
Book title : 35th International Cosmic Ray Conference, ICRC 2017
Journal name in source: Proceedings of Science
ISSN: 1824-8039
Web address : https://pos.sissa.it/301/
Self-archived copy’s web address: https://research.utu.fi/converis/portal/detail/Publication/31843157
PKS1510-089 is a flat spectrum radio quasar located at a redshift of 0.36. It is one of only a few such sources detected in very-high-energy (VHE, >100 GeV) gamma rays. Though PKS1510-089 is highly variable at GeV energies, until recently no variability has been observed in the VHE band. In 2015 May PKS1510-089 showed a high state in optical and in the GeV range. A VHE gamma-ray flare was detected with MAGIC at that time, showing the first instance of VHE gamma-ray flux variability on the time scale of days in this source. We will present the MAGIC results from this observation, discuss their temporal and spectral properties in the multi-wavelength context and present modelling of such emission in the external Compton scenario.
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