Long-term X-ray variability characteristics of the narrow-line Seyfert 1 galaxy RE J1034+396

This publication uses data from the AstroSat mission of the Indian Space Research Organisation (ISRO). AstroSat observed this source as part of its SXT-guaranteed time program for AGN studies (PI: K. P. Singh). This work has used the data from the Soft X-ray Telescope (SXT) developed in a collaboration between TIFR, Mumbai, and the University of Leicester and the Large X-ray Proportional Counter Array (LAXPC) developed at TIFR, Mumbai. The SXT and LAXPC POCs at TIFR are thanked for verifying and releasing the data via the ISSDC data archive and providing the necessary software tools. This research has made use of the data and software obtained from NASAs High Energy Astrophysics Science Archive Research Center (HEASARC), a service of Goddard Space Flight Center and the Smithsonian Astrophysical Observatory. The use of the XRT DATA ANALYSIS SOFTWARE (XRTDAS) developed under the responsibility of the ASI Science Data Center (ASDC) is gratefully acknowledged. This work has made use of observations obtained with XMM–Newton, an ESA science mission with instruments and contributions directly funded by ESA member states and the USA (NASA). Partial support for the SXT UK–Indian collaboration was provided by the UKIERI programme of the British Council and Royal Society. Kishor Chaudhury expresses his profound gratitude to Dr. Samir Kumar Sarkar for teaching the data analysis procedure and special thanks to Dr. Arunava Bhadra for his valuable suggestions.