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

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Photometry R. Corbet Two methods Talk Outline LAT specific considerations Recipe for LAT aperture photometry Error bars for low count rates Periodicity Searches Binary gamma-ray sources Searching for periods, power spectra Weighting power spectra, exposure weighting COSPAR CBW 2010 2
R. Corbet What is Photometry? Photometry is the measurement of the flux from an astronomical source of photons. It can either be an absolute measurement of the flux (e.g. ergs cm -2 s -1 ) or a relative measurement (e.g. counts s -1 ). Relative measurements may be either relative to other objects, or to the same object at different times. A light curve is a series of photometric measurements as a function of time. COSPAR CBW 2010 3
Page 1: R. Corbet LAT Light Curve Analysis:
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 36 and 37: Exposure Weighted Rates vs. Unweigh
Page 38: Results of Looking for Binary Orbit

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

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