GBM/LAT LLE joint data analysis capability - Fermi - Nasa

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LAT Low Energy (LLE) analysis • How to think about the data – In our standard analysis (steady source, diffuse emission, flaring blazars,…) background rejection on “event by event” basis, using classification trees to reduce the particle contamination, classify the event, improve the quality of the signal (PSF, energy dispersion,…). – LLE Analysis: For GRBs, Solar Flares (rapid transients) we can also use the temporal profile to reduce the background. This information can be used to relax the “standard cuts” and open the effective area at low energy by an enormous amount. LLE Pass7 - Transient Pass7 - Source LLE analysis makes accessible a new energy range. At high energy Standard analysis more efficient. LLE Standard analysis >100MeV Standard analysis >1GeV
Opening new windows on transient sources Solar Flares During solar flares the high flux of hard X-rays causes pileup in the ACD. High probability to discard gammarays during the on-ground analysis due to ACD hits. LLE is immune to this feature. 3
Page 1: GBM/LAT LLE joint data analysis cap
Page 5 and 6: Serving the community: The LLE data
Page 7 and 8: LLE data product (bn100612038) •
Page 9 and 10: LLE analysis GUI • We have writte
Page 11 and 12: LLE Analysis GUI
Page 14 and 15: Select the pre-flare background Hol
Page 16 and 17: Results: • A series of output fil
Page 18 and 19: XSPEC command (load the data)
Page 20: The result • Using chi^2 statisti

GBM/LAT LLE joint data analysis capability - Fermi - Nasa

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