LAT Light Curve Analysis: Aperture Photometry and ... - Fermi - NASA

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Exposure Weighted Rates vs. Unweighted Raw Counts Exposure weighting of rates: Divide counts in bin by exposure time to get rates. Use a weight based on time - the weight is essentially multiplying by exposure time. i.e. both divide <strong>and</strong> multiply by exposure. Do effects of exposure just cancel out? No! - Crucial difference is subtraction of mean before calculating power spectrum. R. Corbet COSPAR CBW 2010 36
Comparing weighting methods: 1ks “Counts” 1ks Exposure weighted 1ks Error weighted 1ks time bins. No weighting 1 day time bins. No weighting. Red line = known binary period. Blue arrow = <strong>Fermi</strong> orbital period. R. Corbet COSPAR CBW 2010 37
Page 1 and 2: R. Corbet LAT Light Curve Analysis:
Page 3 and 4: R. Corbet What is Photometry? Phot
Page 5 and 6: R. Corbet LAT Photometry LAT light
Page 7 and 8: LAT Aperture Optimization In optic
Page 9 and 10: Tools Used for Aperture Photometry
Page 11 and 12: Get Photon File Start/Stop Times $
Page 13 and 14: R. Corbet Calculate GTIs (Good Time
Page 15 and 16: Calculate Exposures of Time Bins $
Page 17 and 18: R. Corbet COSPAR CBW 2010 17
Page 19 and 20: R. Corbet barycentering barycenter
Page 21 and 22: R. Corbet Crude Approach to Low-Cou
Page 23 and 24: Looking for Binary Orbital Periods
Page 25: Power Spectrum of a Note Played R.
Page 28 and 29: R. Corbet Calculating Power Spectra
Page 30 and 31: • What should be done if data poi
Page 32 and 33: Weighting Can Reveal Orbital Period
Page 34 and 35: How should LAT data be weighted? W
Page 38: Results of Looking for Binary Orbit

LAT Light Curve Analysis: Aperture Photometry and ... - Fermi - NASA

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