1. Institute of Space Sciences (ICE/CSIC), Campus UAB, Carrer de Can Magrans s/n, E-08193 Barcelona, Spain
2. Institut d’Estudis Espacials de Catalunya (IEEC), E-08034 Barcelona, Spain
3. Deutsches Elektronen Synchrotron DESY, D-15738 Zeuthen, Germany
4. Centre for Space Research, North-West University, 2520 Potchefstroom, South Africa
5. Astronomical Observatory of Ivan Franko National University of Lviv, Kyryla i Methodia 8, UA-79005 Lviv, Ukraine
6. Institute of Physics and Astronomy, University of Potsdam, D-14476 Potsdam, Germany
7. Purple Mountain Observatory and Key Laboratory of Radio Astronomy, Chinese Academy of Sciences, Nanjing 210034, China
8. CTA Observatory GmbH, Via Piero Gobetti 93, I-40129 Bologna, Italy