1. GLAST LAT ProjectDOE/NASA Review of the GLAST/LAT Project, Feb. 13-15, 2001 Peter Michelson 1 GLAST Large Area Telescope: LAT Project Overview Peter F. Michelson Department of Physics, HEPL, & SLAC Stanford University Principal Investigator and Spokesperson peterm@leland.stanford.edu Gamma-ray Large Area Space Telescope

2. GLAST LAT ProjectDOE/NASA Review of the GLAST/LAT Project, Feb. 13-15, 2001 Peter Michelson 2 LAT Project Overview Outline  Overview of GLAST Mission  LAT Team Presentations  Project History  LAT Instrument Design Overview  LAT Collaboration: Organization, Agreements, etc.  Science: Overview, Goals and Science Requirements Document

3. GLAST LAT ProjectDOE/NASA Review of the GLAST/LAT Project, Feb. 13-15, 2001 Peter Michelson 3 GLAST Mission  high-energy gamma-ray observatory; 2 instruments - Large Area Telescope (LAT) - Gamma-ray Burst Monitor (GBM)  launch (Sept 2005): Delta 2 class  mission operations  science - LAT Collaboration - GBM team - Guest Observers  lifetime: 5 years (minimum) Gamma-ray Large Area Space Telescope GLAST Observatory spacecraft LAT GBM GRB Coordinates Network Burst and transient Alerts Alerts Large loads TOO commands Routine Data LAT Data Spacecraft, GBM data Schedules Spacecraft data for archiving Status Command Loads Status Command Loads LAT Inst. Ops. Center LAT data handling Instrument performance Level 0,1 data processing Science Support Center Science scheduling Archiving Guest Observer Support Standard product processing Mission Ops Center Observatory safety Spacecraft health Commanding Mission scheduling GBM data handling GBM Inst. Ops. Center Instrument performance Standard product processing

4. GLAST LAT ProjectDOE/NASA Review of the GLAST/LAT Project, Feb. 13-15, 2001 Peter Michelson 4 LAT Review Committee Charge Review the technical progress, including the status of R&D, relative to the scientific requirements for the instrument; Examine the proposed budget, cost, and schedule profile, including commitment of funds and personnel, to determine its adequacy to complete the project on schedule and on budget. Is the contingency adequate for the project at this stage of development? Evaluate the management structures, including the relationships to the GLAST Mission organization and relationships with foreign collaborating institutes, as to their adequacy to deliver the LAT within the specifications and on time for the projected launch date.

5. GLAST LAT ProjectDOE/NASA Review of the GLAST/LAT Project, Feb. 13-15, 2001 Peter Michelson 5 LAT Instrument Team Presentations Project OverviewP. Michelson Project ManagementW. Althouse Instrument DesignS. Ritz TrackerR. Johnson CalorimeterN. Johnson Anticoincidence DetectorJ. Ormes Electronics, DAQ, G. Haller & Flight Software Mechanical SystemsM. Nordby Integration & Test, CalibrationM. Nordby Science Analysis Software R. Dubois & Inst. Ops. Ctr. WBS#Description 4.1.1Instrument Management 4.1.2Systems Engineering 4.1.3(Reserved) 4.1.4Tracker 4.1.5Calorimeter 4.1.6Anti-Coincidence Detector 4.1.7Electronics and Data Acquisition 4.1.8Mechanical Systems 4.1.9Instrument Integration and Test 4.1.APerformance & Safety Assurance 4.1.BInstrument Operations Center 4.1.CEducation & Public Outreach 4.1.DScience Analysis Software 4.1.ESuborbital Flight Test

6. GLAST LAT ProjectDOE/NASA Review of the GLAST/LAT Project, Feb. 13-15, 2001 Peter Michelson 6 GLAST LAT Project History LAT concept and technology in development since 1992, with DOE/NASA support Initial collaboration members proposed GLAST as New Mission Concept in Astrophysics to NASA Office of Space Science, Nov 1994 Mission endorsed by NASA Space Science Advisory Committee and highest priority of Structure and Evolution of the Universe Subcommittee, Nov 1997 Presented to HEPAP, Jan 1997; submitted proposal for LAT to DOE, Feb 1998; reviewed by SAGENAP, April 1998 Reviewed and endorsed by French Space Agency (CNES), 1998 Collaboration LAT Flight Proposal selected by NASA, Feb 2000 –Foreign endorsement of proposal by CNES, CEA, IN2P3, ASI, INFN, JGC, SGC Wallenberg Foundation approves support for Swedish participation, Mar 2000 NRC Decadal Astronomy & Astrophysics Review ranks GLAST highest priority “moderate-size” space mission for next decade, Sept 2000 NASA Independent Assessment of Mission, May-Sept, 2000 Mission Systems Requirements Review, Sept 27, 2000 Joint ASI/INFN (Italy) committee agree on joint funding, Dec 2000; INFN Group II reviews/endorses funding for INFN participation, Jan 2001

7. GLAST LAT ProjectDOE/NASA Review of the GLAST/LAT Project, Feb. 13-15, 2001 Peter Michelson 7 Large Area Telescope (LAT) Design Overview 16 towers  modularity height/width = 0.4  large field-of-view Si-strip detectors: total of ~10 6 ch. hodoscopic CsI crystal array  cosmic-ray rejection  shower leakage correction shower max contained < 100 GeV segmented plastic scintillator  minimize self-veto Instrument Tracker Calorimeter Anticoincidence Detector Shield 3000 kg, 650 W (allocation) 1.75 m  1.75 m  1.0 m 20 MeV – 300 GeV e+e+ e–e–  Flight Hardware & Spares 16 Tracker Flight Modules + 2 spares 16 Calorimeter Modules + 2 spares 1 Flight Anticoincidence Detector Data Acquisition Electronics + Flight Software

8. GLAST LAT ProjectDOE/NASA Review of the GLAST/LAT Project, Feb. 13-15, 2001 Peter Michelson 8 International Collaboration ~ 100 collaborators from 28 institutions ~ 100 collaborators from 28 institutions CAL expertise in each science topic (theory + obs.) experience in high-energy and space instrumentation access to X-ray, MeV, and TeV observatories by collaboration for multi-wavelength observations ‘mirror’ data site in Europe expertise in each science topic (theory + obs.) experience in high-energy and space instrumentation access to X-ray, MeV, and TeV observatories by collaboration for multi-wavelength observations ‘mirror’ data site in Europe Organizations with LAT Hardware Involvement Stanford University & Stanford Linear Accelerator Center NASA Goddard Space Flight Center Naval Research Laboratory University of California at Santa Cruz University of Washington Commissariat a l’Energie Atomique, Departement d’Astrophysique (CEA) Institut National de Physique Nuclearie et de Physique des Particules (IN2P3): Ecole Polytechnique, College de France, CENBG (Bordeaux) Hiroshima University Institute of Space and Astronautical Science, Tokyo RIKEN Tokyo Institute of Technology Instituto Nazionale di Fisica Nucleare (INFN): Pisa, Trieste, Bari, Udine, Perugia, Roma Royal Institute of Technology (KTH), Stockholm Organizations with LAT Hardware Involvement Stanford University & Stanford Linear Accelerator Center NASA Goddard Space Flight Center Naval Research Laboratory University of California at Santa Cruz University of Washington Commissariat a l’Energie Atomique, Departement d’Astrophysique (CEA) Institut National de Physique Nuclearie et de Physique des Particules (IN2P3): Ecole Polytechnique, College de France, CENBG (Bordeaux) Hiroshima University Institute of Space and Astronautical Science, Tokyo RIKEN Tokyo Institute of Technology Instituto Nazionale di Fisica Nucleare (INFN): Pisa, Trieste, Bari, Udine, Perugia, Roma Royal Institute of Technology (KTH), Stockholm TKR CAL ACD TKR CAL ACD CAL TKR CAL

9. GLAST LAT ProjectDOE/NASA Review of the GLAST/LAT Project, Feb. 13-15, 2001 Peter Michelson 9 GLAST LAT Organization System Engineer T. Thurston, SU-SLAC Integration & Test M. Nordby, SU-SLAC Mech. Systems M. Nordby, SU-SLAC Project Controls T. Boysen, SU-SLAC Performance & Safety Assurance D. Marsh, SU-SLAC Principal Investigator P. Michelson, SU Project Manager W. Althouse, SU-SLAC Instrument Design Team T. Kamae, SLAC Instrument Scientist S. Ritz, GSFC E/PO L. Cominsky, SSU SSAC N. Gehrels, GSFC Collaboration Science Team Electronics & DAQ G. Haller, SU-SLAC Instrument Design Team T. Kamae, SU-SLAC SSAC N. Gehrels, GSFC Collaboration Science Team Sci. Software R. Dubois, SU-SLAC Team IOC S. Williams, SU-HEPL CAL N. Johnson, NRL France, Sweden TKR R. Johnson, UCSC SLAC, Italy, Japan ACD J. Ormes, GSFC Balloon Flight D. Thompson, GSFC Team

10. GLAST LAT ProjectDOE/NASA Review of the GLAST/LAT Project, Feb. 13-15, 2001 Peter Michelson 10 SSAC Charter Advise PI/Spokesperson on the conduct of the LAT Science Investigation Implement collaboration membership policy and publication policy Advise PI and LAT Management on LAT design issues that critically impact science performance Meets quarterly Collaboration Organization Senior Scientist Advisory Committee –Membership N. Gehrels, Chair P. Michelson, PI/Spokesperson G. Barbiellini, Italy R. Bellazzini, Italy E. Bloom, U.S. T. Burnett, U.S. P. Carlson, Sweden A. Djannati-Atai, France R. Dubois, U.S. I. Grenier, France N. Johnson, U.S. R. Johnson, U.S. T. Kamae, Japan J. Ormes, U.S. S. Ritz, U.S. H. Sadrozinski, U.S. D. Thompson, U.S. K. Wood, U.S.

11. GLAST LAT ProjectDOE/NASA Review of the GLAST/LAT Project, Feb. 13-15, 2001 Peter Michelson 11 Collaboration Organization Instrument Design Team –Chair: T. Kamae, Instrument Technical Manager –Deputy Chairs: R. Bellazzini (Italy), E. Bloom (US), J. Paul (France) –Membership includes all subsystem managers & key system engineering personnel –Reports to Project Manager, W. Althouse IDT Charter Facilitate exchange of information between subsystems to maintain coordinated design; resolve issues or refer to IPO for resolution Meetings open to the Collaboration Weekly video conference meetings

12. GLAST LAT ProjectDOE/NASA Review of the GLAST/LAT Project, Feb. 13-15, 2001 Peter Michelson 12 Summary of MoAs MoAs between Stanford University-SLAC and collaborating institution(s) regarding participation in LAT Project –Ratify flight proposal and define technical role –Establish management policies and areas of responsibility –Establish responsibilities and membership of committees of the collaboration Senior Scientist Advisory Committee (SSAC) Instrument Design Team (IDT) –Define International Finance Committee Meet periodically to review status of funding commitments of all partners Membership representative of all funding agencies involved in the LAT –Identify Key Personnel –Includes: Statement of Work, general conditions concerning cross-waiver of liability, data & intellectual property, international exchange of information & materials –Signatories: –Stanford University: SLAC Director & PI; –collaborating institutions: responsible institutional management authorities, lead scientist(s), subsystem manager

13. GLAST LAT ProjectDOE/NASA Review of the GLAST/LAT Project, Feb. 13-15, 2001 Peter Michelson 13 Agreements concerning LAT Project MoAs between SU-SLAC and collaborating institution(s) – GSFC/LHEA3/15/01 – NRL3/15/01 – CEA/DAPNIA & IN2P3, France; NRL4/15/01 –Royal Inst. Of Technology & Stockholm Univ., Sweden; NRL3/01/01 – UCSC/SCIPP4/01/00 – INFN, Italy; UCSC/SCIPP5/01/01 – Hiroshima Univ., ISAS & RIKEN, Japan; UCSC/SCIPP3/01/01

14. GLAST LAT ProjectDOE/NASA Review of the GLAST/LAT Project, Feb. 13-15, 2001 Peter Michelson 14 Agreements concerning LAT Project DOE – NASA: Implementing Arrangement –establish US agency roles & responsibilities for LAT Project; define Joint Oversight Group (JOG) DOE – Stanford University: M&O Contract for SLAC work at SLAC on LAT authorized by Project Number KA050102-EQU01CC NASA – Stanford University: Contract NAS 5-00147 authorizes NASA funding for work at SU on LAT Project SU – Sonoma State University: Subcontract for E/PO NASA – NRL: Defense Purchase Request NASA – CNES (French Space Agency): International Agreement establishes overall participation of France in GLAST NASA – ASI (Italian Space Agency): International Agreement establishes ASI provision of Malindi Ground Station; acknowledges ASI contribution to LAT (managed by INFN)

15. GLAST LAT ProjectDOE/NASA Review of the GLAST/LAT Project, Feb. 13-15, 2001 Peter Michelson 15 Scientific Heritage: CGRO-EGRET Cygnus Region 3C279 Geminga Vela Cosmic Ray Interactions With ISM LMC PKS 0528+134 PKS 0208-512 Crab PSR B1706-44 EGRET All-Sky Map (E> 100MeV)

16. GLAST LAT ProjectDOE/NASA Review of the GLAST/LAT Project, Feb. 13-15, 2001 Peter Michelson 16 3 rd EGRET Source Catalog 271 sources 172 sources are unidentified

17. GLAST LAT ProjectDOE/NASA Review of the GLAST/LAT Project, Feb. 13-15, 2001 Peter Michelson 17 GLAST Science Topics Active Galactic Nuclei Isotropic Diffuse Background Radiation Cosmic Ray Production: –Identify sites and mechanisms Endpoints of Stellar Evolution –Neutron Stars/Pulsars –Black Holes Unidentified Gamma-ray Sources Dark Matter Solar Physics Gamma-Ray Bursts DISCOVERY!

18. GLAST LAT ProjectDOE/NASA Review of the GLAST/LAT Project, Feb. 13-15, 2001 Peter Michelson 18 LAT Source Catalogs > 1 GeV M31 > 1 GeV 2 days of the survey: 344 sources GRB, AGN, 3EG + Gal. plane & halo sources rapid alert for GRBs (  15 s to the ground) sky survey data analyzed on a daily basis timely IAU circulars and WWW announcements  GRB catalog Transients or Flares precise interstellar emission model new statistical analyses including variability and spectral signatures  distinguish unresolved gas clumps  flux histories cross references with astronomical catalogs Catalog strategy LAT Catalog: ~10,000 sources (1 yr)

19. GLAST LAT ProjectDOE/NASA Review of the GLAST/LAT Project, Feb. 13-15, 2001 Peter Michelson 19 LAT Science capabilities - resolution Source localization (68% radius)  bursts 1 to tens of arcmin Unidentified EGRET sources 0.3’ to 1’ Extended sources spatially & spectrally resolved Supernova Remnants  cosmic-ray & plerion acceleration Interstellar emission up to TeV,  E/E   0 decay emission  cosmic-ray propagation pc  kpc Nearby galaxies & Galaxy clusters  cosmic-ray production & halos > 1 GeV M31 > 1 GeV

20. GLAST LAT ProjectDOE/NASA Review of the GLAST/LAT Project, Feb. 13-15, 2001 Peter Michelson 20 Science capabilities - sensitivity 200  bursts per year  prompt emission sampled to > 20 µs AGN flares > 2 mn  time profile +  E/E  physics of jets and acceleration  bursts delayed emission all 3EG sources + 80 new in 2 days  periodicity searches (pulsars & X-ray binaries)  pulsar beam & emission vs. luminosity, age, B 10 4 sources in 1 -yr survey  AGN: logN-logS, duty cycle, emission vs. type, redshift, aspect angle  extragalactic background light (  + IR-opt)  new  sources (µQSO, ext. galaxies, clusters) 1 yr catalog 100 s 1 orbit 1 day LAT 1 yr 2.3 10 -9 cm -2 s -1 3EG  limit 0.01  0.001 large field-of-view

21. GLAST LAT ProjectDOE/NASA Review of the GLAST/LAT Project, Feb. 13-15, 2001 Peter Michelson 21 GLAST Mission Science Requirements Document Heritage of SRD: –GLAST Mission Facility Science Definition Team: broadly representative of international astro-particle physics community Developed first GLAST Mission SRD before NASA flight AO issued – February 1999 –GLAST Mission Science Working Group: Representation from LAT Collaboration, GBM team, community (Interdisciplinary Scientists) Advisory to GLAST Mission Updated SRD – September 2000, consistent with LAT Flight Proposal, GBM Flight Proposal, Level-1 Mission Requirements Document Level-1 Requirements Document – NASA Hdqtrs / DOE

22. GLAST LAT ProjectDOE/NASA Review of the GLAST/LAT Project, Feb. 13-15, 2001 Peter Michelson 22 Simplified Requirements Flow Mission Science Requirements Document (SRD) LAT System Specifications Interface Requirements Document (IRD) Design Trade Study Space Mission System Specification (MSS) LAT Subsystem Requirements Mission Assurance Requirements (MAR)

23. GLAST LAT ProjectDOE/NASA Review of the GLAST/LAT Project, Feb. 13-15, 2001 Peter Michelson 23 FOV w/ energy measurement due to favorable aspect ratio Effects of longitudinal shower profiling More than 40 times the sensitivity of EGRET LAT Performance Large Effective Area (20 MeV – 1 TeV) Optimized Point Spread Function (0.35 o @ 1 GeV) Wide Field of View (2.4 sr) Good Energy Resolution (  E/E ~ 10%) Includes Bkgrd. Rejection

24. GLAST LAT ProjectDOE/NASA Review of the GLAST/LAT Project, Feb. 13-15, 2001 Peter Michelson 24 Summary LAT Instrument based on proven technologies – instrument design and technology under development since 1992; completing design for PDR/Baseline Review LAT Instrument Project Office at SU-SLAC now staffed Obtaining LAT goals made possible by sponsorship of DOE, NASA and foreign partners (France, Italy, Japan, Sweden) GLAST Large Area Telescope (LAT) Collaboration now well defined; but confirmed agreements not yet signed with key partners; introduces schedule risk –Working aggressively to finalize MoAs (and International Agreements) –Working to facilitate DOE – NASA Implementing Arrangement