On-Orbit Performance of the GLAST Burst Monitor Curran D. - - PowerPoint PPT Presentation

Background Projects Results

On-Orbit Performance of the GLAST 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

Background Projects Results What is GLAST? What is GBM? What is it Good for?

Outline

1

Background What 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

Background Projects Results What is GLAST? What is GBM? What is it Good for?

What is GLAST?

Gamma-Ray Large Area Space Telescope Successor to Compton Gamma Ray Observatory Launched Wednesday, June 11, 2008 Two instruments:

Large Area Telescope (LAT) GLAST Burst Monitor (GBM)

Curran D. Muhlberger, Charles A. Meegan On-Orbit Performance of the GLAST Burst Monitor

Background Projects Results What is GLAST? What is GBM? What is it Good for?

What is GBM?

The GLAST Burst Monitor supports the LAT by detecting and localizing gamma-ray bursts. Digital successor to BATSE 12 NaI detectors 2 BGO detectors (overlap LAT energy range) Extremely large field-of-view Rapid burst notification for robotic telescopes

Curran D. Muhlberger, Charles A. Meegan On-Orbit Performance of the GLAST Burst Monitor

Background Projects Results What is GLAST? What is GBM? What is it Good for?

What is it Good for?

Gamma-ray bursts are the most powerful events in the Universe Most gamma-ray sources are still unidentified High energy astronomy can probe fundamental physics

Curran D. Muhlberger, Charles A. Meegan On-Orbit Performance of the GLAST Burst Monitor

Background Projects Results Collaboration Support Performance Evaluation Operations Support

Outline

1

Background

2

Projects Collaboration Support Performance Evaluation Operations Support

3

Results

Curran D. Muhlberger, Charles A. Meegan On-Orbit Performance of the GLAST Burst Monitor

Background Projects Results Collaboration Support Performance Evaluation Operations 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

Background Projects Results Collaboration Support Performance Evaluation Operations Support

InterPlanetary Network

Software Features

Generate high-res lightcurve from TTE data Choose detectors to maximize signal-to-noise Correctly adjust for leap seconds and deadtime Format output for use by existing software

Count Rate [cps]

Comparison of GRB Lightcurves

IPN 1000 1500 2000 2500 3000 Count Rate [cps] CTIME 1000 1500 2000 2500 3000 Count Rate [cps] Time from Trigger [s] CSPEC 1000 1500 2000 2500 3000

• 4
• 2

2 4 6 8 10 12

The InterPlanetary Network uses observations from multiple spacecraft to pinpoint a burst’s location.

Curran D. Muhlberger, Charles A. Meegan On-Orbit Performance of the GLAST Burst Monitor

Background Projects Results Collaboration Support Performance Evaluation Operations Support

Performance Evaluation Software

Software Products

Portable C library for processing Level 1 data Consistency check for CSPEC, CTIME, and TTE Burst hardness calculator Parser for Automatic Gain Control diagnostic packets Coincidence rate calculator Bug discovery and diagnosis

Energy [keV] Timescale [ms] zmax Rate [yr−1] 50-300 64 4.5 23.5 50-300 128 4.5 11.8 10-50 64 5.5 0.3 10-50 128 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

Background Projects Results Collaboration Support Performance Evaluation Operations Support

Operations Support

Operations Support Software

IOTL parser and report generator IOTL/ATS comparison parser Online database viewers

Level 0 files by date Level 1 continuous files Level 1 trigger files

Curran D. Muhlberger, Charles A. Meegan On-Orbit Performance of the GLAST Burst Monitor

Background Projects Results Collaboration Support Performance Evaluation Operations Support

Web Applications

Curran D. Muhlberger, Charles A. Meegan On-Orbit Performance of the GLAST Burst Monitor

Background Projects Results Current Status The End

Outline

1

Background

2

Projects

3

Results Current Status The End

Curran D. Muhlberger, Charles A. Meegan On-Orbit Performance of the GLAST Burst Monitor

Background Projects Results Current Status The End

Results

GIOC features functional and stylish real-time display CSPEC, CTIME, and TTE data appear to be self-consistent Timing bugs discovered and diagnosed Trigger algorithm thresholds reset knowing expected coincidence rates IPN to receive custom-formatted high-resolution lightcurves Scientists can quickly calculate burst hardness ratios GBM team members have web access to pipeline databases Operators can quickly check IOTLs for correctness Future programs can build off of a high-level C library Everyone learned something new!

Curran D. Muhlberger, Charles A. Meegan On-Orbit Performance of the GLAST Burst Monitor

Background Projects Results Current Status The End

Questions?

Curran D. Muhlberger, Charles A. Meegan On-Orbit Performance of the GLAST Burst Monitor