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

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More Advanced Error Bar Treatment Dealing with error bars for small numbers of counts has been discussed in the astronomical literature by e.g. R. Corbet Gehrels, 1986, ApJ, 303, 336 Kraft, Burrows, & Nousek, 1991, ApJ, 374, 344 Useful review of concept of “coverage” by Heinrich in: www-cdf.fnal.gov/publications/cdf6438_coverage.pdf COSPAR CBW 2010 20
R. Corbet Crude Approach to Low-Count Errors Instead of taking errors as N 1/2 , where N is the observed number of counts, look at the ends of the error bars. i.e. what underlying “population” count rate would be consistent with the “sample” count rate? σ = ±0.5 + sqrt(N + 0.25) e.g. 0 → 0, +1, -0 1 → 1, +1.62, -0.62 2 → 2, +2, -1 If needed, these errors can be “symmetrized”. COSPAR CBW 2010 21
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: R. Corbet barycentering barycenter
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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