The US INTEGRAL Public Data Archive

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The US INTEGRAL Public Data Archive
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INTEGRAL Archive Milestones

• July 2004 The ISDC INTEGRAL Public Data Archive
  opened with data up to revolution 66
  (5-1-03).
• September 2004 The US INTEGRAL Public Data
  Archive at the HEASARC opened.
• January 2005 All public data was reprocessed
  into revision 2 format.
• January 2005 New GO and CP data released in
  revision 2.
• February 2005 The US INTEGRAL Public Data
  Archive at the HEASARC switches over to revision
  2 format data.
• March 2005 All data available from ISDC in
  revision 2 format.

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Revision 2 Changes

• The main differences between revision 1 and 2
  are
• a simplified directory and file structure
• the availability of event time stamps in Julian
  Dates (JD), with corrected energies, standard
  good time intervals (GTIs) and deadtime in the
  science window datasets
• the event files are now in the standard OGIP
  format as adopted for other high-energy missions
• all JD time stamps are now corrected for the
  various offsets described in Table 2 and 3 of
  Walter et al, 2003, AA 411, L25.
• some optimization of the attitude handling have
  now been implemented
• some statistical products created for the purpose
  of the instrument monitoring have been removed

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Current Public Data Archive Status

• New public data is available to the community
  within a few days of its release from the ISDC.
  The limiting factor is the low data transfer rate
  from the ISDC (only a factor of a few better than
  real time).
• All public data through the latest release (6-17)
  is currently available from the HEASARC archive.
• Public data releases occur monthly with the next
  releases scheduled for 7-22 and 8-8.

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Accessing the US INTEGRAL Public Data Archive

• The US INTEGRAL Public Data Archive is accessible
  from the HEASARC via Browse or FTP.
• Accessing the data via Browse is complicated by
  the large size of the typical observation, 3 days
  of data 7-8 GB.
• The HEASARC limit for a tar file is 3.5 GB gt
  the preferred download method is via a wget
  script created by Browse.
• A detailed description of all the INTEGRAL
  catalogs available through Browse as well as a
  detailed cookbook describing the downloading of
  data and the setting up of a local data
  repository are available on the GOF website
  http//heasarc.gsfc.nasa.gov/docs/integral/inthp_a
  rchive.html

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Archive Usage Statistics

• March 60.0 GB
• April 23.5 GB
• May 9.8 GB
• June 36.0 GB
• -------------------------------------------------
• Average 32.3 GB