How Much X-Ray and Gamma-ray Data Are in the HEASARC's Archive?


Last Update: 2014 April 08

As of April 2014, there were about 57 Terabytes (TB = 1 billion kB) of X-ray and gamma-ray data in the HEASARC's high-energy archive, compared to 38 TB in April 2012, 1.8 TB at the start of 2000 and 0.3 TB at the start of 1995. Recent growth has been mostly due to the increasing size of the Swift (now 15.0 TB), INTEGRAL (now 10.9 TB), Fermi (now 10.4 TB), XMM-Newton (now 6.4 TB) and Suzaku (now 5.1 TB) archives. Other HEASARC missions which are currently being archived include Chandra (now 2.1 TB) and NuSTAR (now 0.9 TB). Data volumes from older missions are typically much smaller, except for the recently ended RXTE (2.7 TB) and BeppoSAX (1.3 TB) missions.

For more detailed statistics, including a breakdown of the data holdings by mission, check out the HEASARC Usage Statistics webpage.


Figure 1: Growth of the HEASARC High-Energy Data Archive and Annual Volume Downloaded by Users.


Start Archive Size Archive Growth No of Active High-Energy of Year in TB Rate in TB HEASARC Missions 1993 0.001 0.001 4 Launch of ASCA 1994 0.014 0.013 4 1995 0.30 0.29 5 Launch of RXTE 1996 0.45 0.15 6 Launch of SAX 1997 0.55 0.10 6 1998 0.96 0.41 6 1999 1.37 0.41 7 Launch of Chandra & XMM; End of ROSAT 2000 1.84 0.47 5 End of CGRO & ASCA 2001 2.13 0.29 5 Launch of HETE2; End of EUVE 2002 2.52 0.39 5 Launch of Integral; End of SAX 2003 2.85 0.33 5 2004 3.12 0.27 6 Launch of Swift 2005 4.84 1.72 7 Launch of Suzaku 2006 8.27 3.43 7 2007 11.90 3.63 6 End of HETE2 2008 17.09 5.19 7 Launch of Fermi 2009 19.88 2.79 7 2010 25.79 5.91 7 2011 30.66 4.87 7 2012 37.90 7.24 7 End of RXTE; Launch of NuSTAR 2013 43.52 5.62 7 2014 53.52 10.00 7


Web page author and maintainer: Stephen A. Drake


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Last modified: Tuesday, 08-Apr-2014 15:25:16 EDT