Analysis of Burst Observations by GLAST's LAT Detector

Details Analysis of Burst Observations by GLAST's LAT Detector Analysis of Burst Observations by GLAST's LAT Detector

2003-12-12

arxiv.org/abs/astro-ph/0312337v1

Astronomy and Astrophysics

Astrophysics

4 pages, 1 figure. To appear in the proceedings of the 2003 GRB Conference (Santa Fe, NM, 2003 Sep 8-12)

Scientific paper

10.1063/1.1810937

Analyzing data from GLAST's Large Area Telescope (LAT) will require sophisticated techniques. The PSF and effective area are functions of both photon energy and the position in the field-of-view. During most of the mission the observatory will survey the sky continuously and thus the LAT will detect each count from a source at a different detector orientation; each count requires its own response function! The likelihood as a function of celestial position and photon energy will be the foundation of the standard analysis techniques. However the 20 MeV-300 GeV emission at the time of the ~100 keV burst emission (timescale of ~10 s) can be isolated and analyzed because essentially no non-burst counts are expected within a PSF radius of the burst location during the burst. Both binned and unbinned (in energy) spectral fitting will be possible. Longer timescale afterglow emission will require the likelihood analysis that will be used for persistent sources.

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