Detection of relic gravitational waves in thermal case by using Adv.LIGO data of GW150914 Basem Ghayour and Jafar Khodagholizadeh Eur. Phys. J. C, 77 8 (2017) 560 Published online: 18 August 2017 DOI: 10.1140/epjc/s10052-017-5135-8