1. GENEVAC: An Application for Calculating, Viewing and Storing Gamma-ray Burst Data Sam Stafford The Ohio State University Department of Physics GRB Temporal Analysis Workshop Los Alamos, NM August 29-31, 2011

2. Overview Summary of GENEVAC application Live Demo HTML output Possible extensions

3. Motivation Over 5,000 bursts recorded since 1970’s Multiple instrument sources; numerous observable parameters Need for versatile, modular platform Common, user-readable format for GRB data to facilitate multiple analyses: – Lightcurves and spectra (prompt, afterglow) – Neutrino emission – Lags – Variability

4. Database of GRB object data Graphical program for parameter calculation and plotting: Light curve Electromagnetic spectra Neutrino spectra Modular design / extensibility Lag / variability Afterglow GENEVAC Gamma-ray-burst Electromagnetic and Neutrino Emission Viewer And Calculator

5. Graphical User Interface Gamma-ray lightcurves – Multiple energy-band display – User-selectable bin size – Background subtraction (polynomial regression) – Drag-and-release zoom – Breakout-window feature on graph displays Facilitates larger display / easier navigation Enhanced display controls

6. Graphical User Interface Gamma-ray and neutrino parameters – Parameters can be calculated or entered manually – Up to four simultaneous models – Pre-programmed and User-definable models – Electromagnetic and neutrino energy spectrum displays – Detector effective area and event rate – Error bars supported in calculations and plots – Graph data can be exported to table Read/write to GRB object database

7. GENEVAC Database Stored in user-readable format Simple keyword structure, can be entered manually or from the GENEVAC screens. Designed for multiple instrument data sources (currently supports BATSE, Swift/BAT, HETE; extensible to Fermi, etc.) Currently populated with >70 long bursts from BATSE catalog Batch conversion process from native instrument data structure to GENEVAC database

8. GENEVAC Database Partial list of valid database keywords: OBJECT_ID INSTRUMENT_ID TRIGGER_NUMBER RIGHT_ASCENSION DECLINATION PEAK_LUMINOSITY JET_ANGLE T90_DURATION BREAK_ENERGY REDSHIFT LORENTZ_BOOST

9. GENEVAC Demo

10. HTML Output Object index page Individual GRB data page: – Parameter table – Light curves – Electromagnetic and neutrino spectra – Detector effective area – Event counts

11. Design Considerations Modular design – Most functions can be called in batch mode as well as in screen display – Allows separation of components among multiple servers if needed Interface-centered design – Allows delegation of computation-intensive tasks – Allows alternate GUI modules (e.g., web client) Written in Java™ 6.0, using Java™ Swing GUI utilities (well-known, mature industry standard; short development cycle) Object-oriented programming model Designed to run on any computer with a Java Runtime Environment (JRE). Web-based version under consideration

12. Architecture GRB Calculation Model GRB Data Model Graphical User Interface Lightcurves Parameters Spectra HTML Utilities Static web pages Libraries Data types BG subtraction Utilities Database Parameter files Temporal data Externally-defined formalisms (in development) Web client (proposed)

13. Future Initiatives Afterglow analysis Additional instruments (e.g. Fermi) Spectral lag (Cross-correlation function, pulse fit) Variability analysis (wavelet, FFT) Web client Usability enhancements (e.g., undo stack)

14. Summary Database of GRB object data Graphical program for calculating parameters: Lightcurve Electromagnetic spectra Neutrino spectra HTML output – Object index table – Spectrum, event rate plots Modular, extensible design – Web client – Afterglow – Variability analysis