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Gamma-ray Large Area Space Telescope Data Challenge Closeout Introduction

This document provides an introduction to the closeout of the Gamma-ray Large Area Space Telescope Data Challenge 1 (DC1), highlighting the objectives, planning approach, minimum results, and suggestions for future studies. It also encourages feedback from participants and emphasizes the importance of collective learning from the data challenge.

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Gamma-ray Large Area Space Telescope Data Challenge Closeout Introduction

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  1. Gamma-ray Large Area Space Telescope DC1 Closeout Introduction February 2004 Steven Ritz ritz@milkyway.gsfc.nasa.gov

  2. Something very significant started…. Recall: DC1 December Workshop post hoc ergo propter hoc?

  3. Purposes of the Data Challenges • “End-to-end” testing of analysis software. • Familiarize team with data content, formats, tools and realistic details of analysis issues (both instrumental and astrophysical). • If needed, develop additional methods for analyzing LAT data, encouraging alternatives that fit within the existing framework. • Provide feedback to the SAS group on what works and what is missing from the data formats and tools. • Uncover systematic effects in reconstruction and analysis. Support readiness by launch time to do all first-year science.

  4. Data Challenge Planning Approach • Walk before running: design a progression of studies. • DC1. Modest goals. Contains most essential features of a data challenge. • 1 simulated day all-sky survey simulation • find the sources, including GRBs • a few physics surprises • exercise: • exposure, orbit/attitude handling, data processing pipeline components, analysis tools • DC2, start end of CY04. More ambitious goals. ~One simulated month. • based on DC1 lessons • discussion tomorrow • DC3. Support for flight science production.

  5. Eye on the ball • This would be very bad…

  6. The DC1 Sky One day all-sky survey. Generated E>20 MeV. E>100 MeV with some other cuts for illustration thanks to Julie! Now the tools are in place to do individual studies after DC1! Lots to analyze! A few surprises to find…

  7. DC1 Minimum Results • The existence of the data sets and the volume of data generated for background analyses already meets one of the success criteria. • All reports of experiences welcome and encouraged • A minimum set of plots and tables that we must collectively produce: • TABLE 1: found sources, ranked by flux (E>100 MeV). Table has the following columns • reconstructed location and error circle • flux (E>100 MeV) and error • significance • 3EG identification (yes or no) [note: DON’T assume DC1 sky is the 3EG catalog!] • extra credit: • include flux below 100 MeV • spectral indices of brightest sources • comparison of 3EG position and flux characteristics with GLAST analysis • FIGURE 1: LogN-logs plot of TABLE1 • TABLE 2: list of transients detected. Columns are • location and error circle • flux (E>100 MeV) and error • significance • duration • FIGURE 2: light curve • Extra credit: FIGURE 2a: spectra. • PLUS: reports of any physics surprises found.

  8. Beyond the minimum • Here were a few suggestions: • generated and released more days of data • better exercise tools and infrastructure • more transients • spectral analyses • localization studies • one-day localization of Vela is particularly interesting • analysis improvements • But don’t let this list limit you. The sky is the limit! • Studies should continue post DC1. Wiki will persist.

  9. Summary • DC1 is already a great success, due to the hard work of many people working together. We have learned many lessons already. • Now the fun part: a parade of results! • Note: we want to hear from everyone who participated in the data challenge. • learning from the efforts that did not result in talks today is a key goal of DC1 !!

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