ESAC_3_24_05.ppt Gamma-ray Large Area Space Telescope – exploring the high-energy universe.

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ESAC_3_24_05.ppt Gamma-ray Large Area Space Telescope – exploring the high-energy universe

2 Gamma-ray Large Area Space Telescope ► flight hardware now arriving at SLAC for instrument integration  4 flight towers installed ► Schedule:  instrument assembly complete: December 2005  instrument environmental tests complete: May 2006  LAT delivery to Spectrum-Astro (General Dynamics) for integration with spacecraft: May 2006  GLAST Launch: August 31, 2007

3 LAT Schedule

4 Critical path to ship LAT to Spectrum Astro

5 Flight Hardware Integration Flight Tracker in Cleanroom at SLAC Flight Calorimeter Preparation of flight grid for TCS integration LAT Integration stand with PAP ready for proof test

6 First Flight Tower in I&T

7 First Integrated Tower – Muon Candidate Event Calorimeter crystals Tracker planes XZ projection YZ projection

8 Gamma-ray Candidate Event

9 Two Towers in Grid

10 First 2-tower events

11 First 2-tower events

12 Interest in GLAST Mission is growing ► At all mission levels, including Conferences, Workshops. ► Multiwavelength survey initiatives underway ─VLA monitoring for a large sample of flat-spectrum, compact sources ─VLBA Imaging and Polarimetry Survey proposed to obtain a set of reference images for 1000 potential LAT sources in advance of GLAST launch ─Northern and Southern hemisphere radio pulsar timing campaigns in support of GLAST mission ─optical and radio monitoring of LAT AGN ► Broad and growing interest COS-B EGRET GLAST ??? Publications & Conference Proceedings pre-launch total

13 Science Groups of LAT Collaboration  groups responsible for analysis and writing papers GroupPrincipal Responsibilities 1. Catalogs Prepare comprehensive LAT catalog for publication, after 1, 2, and 5 years (nominal), including cross-identifications when known. 2. Diffuse (Galactic & Extragalactic) and Molecular Clouds Generate Galactic diffuse model for delivery to community (GSSC) and provide periodic updates; study mass tracers and CR density in individual clouds; Analysis of the residual isotropic gamma-ray emission (after accounting for LAT sources and Galactic diffuse) including its spectra and angular fluctuations; assess contributions from various source classes 3. Blazars & Other AGNs Analysis of spectra and time variability of LAT-detected blazars and other types of AGNs; modeling of spectra (e.g. SSC model) including effects of EBL; study evolution with redshift 4. Pulsars, SNRs & Plerions Construct phase-resolved “light curves” and spectra for LAT-detected radio pulsars; search for periodic emission in other sources, including unidentified sources; identify SNRs and plerions and model spectra of these sources 5. Unidentified Sources, Population Studies, & Other Galaxies Coordinate deep multi-wavelength studies of the error boxes of the unidentified GLAST sources and correlate with potential counterpart populations; determine the heterogeneity of the population and correlate with source characteristics \(e.g. time variability; spectral index, etc.) Search for emission from other galaxies, particularly nearby galaxies such as M31, ULRGs, and from clusters of galaxies; determine source spectra and/or set upper limits 6. Dark Matter and Exotic Physics Search for signatures of dark matter, extra dimensions (e.g. KK graviton decay), quantum gravity dispersion effects, etc. 7. Gamma-Ray Bursts Construct LAT GRB catalogs; determine burst spectra, including time evolution; coordinate joint analysis of bursts with GBM 8. Sources in the Solar System Solar flares; lunar emission; … 9. Calibration and Analysis Methods Pre-flight performance of the LAT and on-orbit calibration and performance (1) Monte Carlo model of LAT; event reconstruction and background rejection methods; (2) astrophysical data analysis methods (e.g. likelihood analysis; time series analysis; source spectral analysis, cross-correlation methods, etc.)

P. F. Michelson GLAST LAT SSAC Meeting: March 15, Science Group Coordinators GroupCoordinators 1. CatalogsSeth Digel (SU-SLAC); Isabelle Grenier (CEA/Saclay) 2. Diffuse (Galactic & Extragalactic) and Molecular Clouds Seth Digel (SU-SLAC); Isabelle Grenier (CEA/Saclay) 3. Blazars & Other AGNsPaolo Giommi (ASDC); Benoit Lott (IN2P3–Bordeaux) 4. Pulsars, SNRs & PlerionsRoger Romani (Stanford); David Thompson (GSFC) 5. Unidentified Sources, Population Studies, & Other Galaxies Patrizia Caraveo (IFC, CNR); Olaf Reimer (Stanford) 6. Dark Matter and Exotic PhysicsElliott Bloom (SU-SLAC); Aldo Morselli (INFN–Rome) 7. Gamma-Ray BurstsJay Norris (GSFC); Nicola Omodei (INFN-Pisa); N. Kawai (start 07; sabbatical at SU 08-09) 8. Sources in the Solar SystemGerry Share (NRL) 9. Calibration and Analysis MethodsWilliam Atwood (UCSC); Steve Ritz (GSFC) Eduardo do Couto e Silva (SU-SLAC, start ~07) ► science coordinator telecons: ~ every two weeks