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

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R. Corbet Extract a Light Curve $ gtbin algorithm=LC evfile=temp3_1DAY_3C454.3.fits outfile=lc_1DAY_3C454.3.fits scfile=L090923112502E0D2F37E71_SC00.fits tbinalg=LIN tstart=266976000. tstop=275369897. dtime=86400 Parameters specify: - Make a light curve (LC) - Input file is output file from gtselect - Spacecraft file - Linear time bins - Start and stop times again - dtime = 86400: 1 day bins Writes to file: lc_1DAY_3C454.3.fits COSPAR CBW 2010 14
Calculate Exposures of Time Bins $ gtexposure infile="lc_1DAY_3C454.3.fits" scfile="L090923112502E0D2F37E71_SC00.fits" irfs="P6_V3_DIFFUSE" srcmdl="none" specin=-2.1 Parameters specify: - Spacecraft file - Instrument response functions (“irfs”). If, for example, SOURCE class rather than DIFFUSE was used in gtselect then use irfs="P6_V3_SOURCE” - srcmdl – enables a more complex model than the default simple power law to be used in the exposure calculation. - specin – photon spectral index for power-law spectrum. Note that the minus sign must be used. An EXPOSURE column is added to the input file: lc_1DAY_3C454.3.fits R. Corbet COSPAR CBW 2010 15
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: R. Corbet Calculate GTIs (Good Time
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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