text: to observe these breaks, GBM is able to see signiﬁcant 
  emission above 300 keV, consistent with the canonical 
  hard spectrum. 
  
  Cen A (Fig. 3) is a Sy 2 galaxy that is the brightest 
  AGN in hard x-rays/low energy gamma rays. It has 
  a hard spectrum (Γ = 1.8) and has been observed at 
  energies > 1 MeV [9]. The GBM results are consis- 
  tent with this hard spectrum, though GBM does not 
  have the sensitivity to determine if the hard spectrum 
  continues beyond 300 keV or if the spectrum cuts oﬀ. 
  Cyg X-1 (Fig. 4) is a HMXB and one of the 
  ﬁrst systems determined to contain a black hole. It 
  has been observed to emit signiﬁcant emission above 
  100 keV including a power law tail extending out to 
  greater than 1 MeV [10, 11]. The GBM results show 
  signiﬁcant emission above 300 keV, consistent with 
  the power law tail observed when Cyg X-1 is in its 
  hard state. 