GLAST LAT Project 1S. Ritz DC1 Closeout Introduction February 2004 Steven Ritz Gamma-ray Large Area Space Telescope.

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Presentation transcript:

GLAST LAT Project 1S. Ritz DC1 Closeout Introduction February 2004 Steven Ritz Gamma-ray Large Area Space Telescope

GLAST LAT Project 2S. Ritz Recall: DC1 December Workshop Something very significant started…. post hoc ergo propter hoc?

GLAST LAT Project 3S. Ritz 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.

GLAST LAT Project 4S. Ritz 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.

GLAST LAT Project 5S. Ritz This would be very bad… Eye on the ball

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

GLAST LAT Project 7S. Ritz 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 encouragedAll 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.

GLAST LAT Project 8S. Ritz 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 The sky is the limit!But don’t let this list limit you. The sky is the limit! Studies should continue post DC1. Wiki will persist.Studies should continue post DC1. Wiki will persist.

GLAST LAT Project 9S. Ritz 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 !!