April 12 - 13, 2006

1
The GLAST Archive
2
GLAST Overview

• GLAST (Gamma-Ray Large Area Space Telescope)
  observations of celestial gamma-ray sources in
  the 10 MeV 100 GeV band
• NASAU.S. Department of Energy institutions in
  France, Germany, Japan, Italy and Sweden.

3
GLAST Instruments
Description Energy band FOV Localization
Large Area Telescope (LAT) PI P. Michelson (Stanford) 16 tracker towers of silicon strip detectors CsI calorimeter Anti-coincidence detector (ACD). 20 MeV-300 GeV 2.4 Sr 0.5 arcmin
GLAST Burst Monitor (GBM) PI C. Meegan (MSFC) 12 sodium iodide (NaI) scintillation detectors and 2 Bismuth Germanate (BGO) scintillation detectors few keV 1 MeV (NaI) 150 keV to 30 MeV (BGO) 10 Sr 3 deg.
4
GLAST Status

• GBM being delivered Spring 2006
• LAT totally integrated and undergoing instrument
  level testing at SLAC
• ACD Complete
• GBM, LAT ACD spacecraft integration summer
  2006
• Launch Sep 7 2007?

5
GLAST Reviews

• Since 2004
• GSSC Detailed Design Peer Review (July 2004)
• GLAST Ground System Design Review (Aug 2004)
• GLAST Users Committee (GUC) meeting at GSFC
  (08/04, 06/05, 11/05)
• Mission Operations Review (3/06)

6
GLAST Data Elements
7
Mission Phases

• Phase 0 On-orbit checkout (L to L2 months)
• Phase 1 Sky survey (L2 months to L14 months
  Dec 07 - Dec 08) limited number of GI pointed
  observations
• Phases 0 and 1 restricted access period. no
  LAT level 1 data (events) will be available to
  any GIs who are not LAT team members. During
  Phase 1 Level 2 data characterizing transients
  will be public Non-transient data and transient
  level 1 data will be public at start of phase 2.
• Phase 2 GI phase (L14 months Dec 08)survey
  mode, pointed mode all data available
  immediately
• The first GI proposals will be due March 2007.

8
Expected Data Volumes

• Level 1 data 75 MB/day (LAT) 0.5MB/day (GBM)
  75.5MB/day (276 GB/Year)
• Level 2 data 2 MB/day (0.7GB/year)
• and a smaller volume of Level 3 data to give a
  total expected yearly data volume of about 300
  Gbytes/year. Assuming a 10 year mission life the
  GSSC will need to provide about 3 Tbytes of data
  storage for the Level 1, 2 and 3 data archive.

9
Data Access Overview
10
Data Access

• FITS event files downloaded from GSSC web
  interface

Or search for bursts sources using BROWSE, and
download LAT/GBM data
11
Analysis
Science Tools (currently version 7 release 0
patch 3) for selection, binning, likelihood
analyses, exposure map generators, pulsar
analysis etc available for Linux
Windows Documentation, user guides and science
threads (source analysis, burst analysis, etc.)
under development Software uses standard HEASoft
interface Burst spectra format compatible with
XSPEC Compatibility with XSELECT under development
12
Tasks in Progress

• Science file formats for LAT and GBM data being
  finalized
• Data Challenge II (March-May 2006) exercises
  processing pipeline, data retrieval, data
  analysis
• GSSC-HEASARC MOU being finalized
• GSSC-HEASARC Interface Control Document under
  development
• Prototype HEASARC archive being used for DC II
• Browse tables being defined
• Prototype LAT CALDB constructed
• all should be ready L-7 months (Feb 2007) for
  expected first release of Phase 0/1 data in Dec
  2008