On-Orbit Performance of the GLAST Burst...
Transcript of On-Orbit Performance of the GLAST Burst...
BackgroundProjectsResults
On-Orbit Performance of theGLAST Burst Monitor
Curran D. Muhlberger (RA) Charles A. Meegan (PI)
Cornell University
University of Maryland
August 8, 2008
Curran D. Muhlberger, Charles A. Meegan On-Orbit Performance of the GLAST Burst Monitor
BackgroundProjectsResults
What is GLAST?What is GBM?What is it Good for?
Outline
1 BackgroundWhat is GLAST?What is GBM?What is it Good for?
2 Projects
3 Results
Curran D. Muhlberger, Charles A. Meegan On-Orbit Performance of the GLAST Burst Monitor
BackgroundProjectsResults
What is GLAST?What is GBM?What is it Good for?
What is GLAST?
Gamma-Ray Large Area SpaceTelescopeSuccessor to Compton GammaRay ObservatoryLaunched Wednesday, June 11,2008Two instruments:
Large Area Telescope (LAT)GLAST Burst Monitor (GBM)
Curran D. Muhlberger, Charles A. Meegan On-Orbit Performance of the GLAST Burst Monitor
BackgroundProjectsResults
What is GLAST?What is GBM?What is it Good for?
What is GBM?
The GLAST Burst Monitor supportsthe LAT by detecting and localizinggamma-ray bursts.
Digital successor to BATSE12 NaI detectors2 BGO detectors (overlap LATenergy range)Extremely large field-of-viewRapid burst notification for robotictelescopes
Curran D. Muhlberger, Charles A. Meegan On-Orbit Performance of the GLAST Burst Monitor
BackgroundProjectsResults
What is GLAST?What is GBM?What is it Good for?
What is it Good for?
Gamma-ray burstsare the mostpowerful events inthe UniverseMost gamma-raysources are stillunidentifiedHigh energyastronomy canprobe fundamentalphysics
Curran D. Muhlberger, Charles A. Meegan On-Orbit Performance of the GLAST Burst Monitor
BackgroundProjectsResults
Collaboration SupportPerformance EvaluationOperations Support
Outline
1 Background
2 ProjectsCollaboration SupportPerformance EvaluationOperations Support
3 Results
Curran D. Muhlberger, Charles A. Meegan On-Orbit Performance of the GLAST Burst Monitor
BackgroundProjectsResults
Collaboration SupportPerformance EvaluationOperations Support
GIOC Display Panel
Real-time display wall powered by STK
Curran D. Muhlberger, Charles A. Meegan On-Orbit Performance of the GLAST Burst Monitor
BackgroundProjectsResults
Collaboration SupportPerformance EvaluationOperations Support
InterPlanetary Network
Software Features
Generate high-reslightcurve from TTE dataChoose detectors tomaximize signal-to-noiseCorrectly adjust for leapseconds and deadtimeFormat output for use byexisting software
Cou
nt R
ate
[cps
]
Comparison of GRB Lightcurves
IPN
1000 1500 2000 2500 3000
Cou
nt R
ate
[cps
] CTIME
1000 1500 2000 2500 3000
Cou
nt R
ate
[cps
]
Time from Trigger [s]
CSPEC
1000 1500 2000 2500 3000
-4 -2 0 2 4 6 8 10 12
The InterPlanetary Networkuses observations from multiplespacecraft to pinpoint a burst’slocation.
Curran D. Muhlberger, Charles A. Meegan On-Orbit Performance of the GLAST Burst Monitor
BackgroundProjectsResults
Collaboration SupportPerformance EvaluationOperations Support
Performance Evaluation Software
Software Products
Portable C library forprocessing Level 1 dataConsistency check forCSPEC, CTIME, and TTEBurst hardness calculator
Parser for Automatic GainControl diagnostic packetsCoincidence rate calculatorBug discovery anddiagnosis
Energy [keV] Timescale [ms] zmax Rate [yr−1]
50-300 64 4.5 23.550-300 128 4.5 11.810-50 64 5.5 0.310-50 128 5.5 0.0≥ 100 64 5.5 0.3≥ 100 128 5.5 0.1
Curran D. Muhlberger, Charles A. Meegan On-Orbit Performance of the GLAST Burst Monitor
BackgroundProjectsResults
Collaboration SupportPerformance EvaluationOperations Support
Operations Support
Operations Support Software
IOTL parser and report generatorIOTL/ATS comparison parserOnline database viewers
Level 0 files by dateLevel 1 continuous filesLevel 1 trigger files
Curran D. Muhlberger, Charles A. Meegan On-Orbit Performance of the GLAST Burst Monitor
BackgroundProjectsResults
Collaboration SupportPerformance EvaluationOperations Support
Web Applications
Curran D. Muhlberger, Charles A. Meegan On-Orbit Performance of the GLAST Burst Monitor
BackgroundProjectsResults
Current StatusThe End
Outline
1 Background
2 Projects
3 ResultsCurrent StatusThe End
Curran D. Muhlberger, Charles A. Meegan On-Orbit Performance of the GLAST Burst Monitor
BackgroundProjectsResults
Current StatusThe End
Results
GIOC features functional andstylish real-time display
CSPEC, CTIME, and TTE dataappear to be self-consistent
Timing bugs discovered anddiagnosed
Trigger algorithm thresholdsreset knowing expectedcoincidence rates
IPN to receive custom-formattedhigh-resolution lightcurves
Scientists can quickly calculateburst hardness ratios
GBM team members have webaccess to pipeline databases
Operators can quickly checkIOTLs for correctness
Future programs can build off ofa high-level C library
Everyone learned somethingnew!
Curran D. Muhlberger, Charles A. Meegan On-Orbit Performance of the GLAST Burst Monitor
BackgroundProjectsResults
Current StatusThe End
Questions?
Curran D. Muhlberger, Charles A. Meegan On-Orbit Performance of the GLAST Burst Monitor