Version 1.2.7  

Period Folding

 

Period Folding Functions

  1. sitar_pfold_rate( t, rate, p [ ; pdot=#, pddot=#, nphs=#, tzero=#] )
    Fold a rate lightcurve on a given period (with optional first and second derivatives).
    Run as: isis> profile = sitar_pfold_rate(t,rate,p; pdot=#,pddot=#,nphs=#,tzero=#);
    Variables in [] are optional qualifier variables.
    Omitted qualifier variables take on default values.

    Inputs:
    • t : Times at which rates are measured
    • rate : Lightcurve rate
    • p : Period on which to fold the lightcurve
    Optional Qualifier Inputs:
    • pdot : Period derivative. Default=0.
    • pddot : Period second derivative. Default=0.
    • nphs : Number of phase bins in output folded lightcurve. Default = 20
    • tzero : Time of zero phase. Default = t[0]
    Outputs:
    • profile.bin_lo : Start value of phase bin
    • profile.bin_hi : Stop value of phase bin
    • profile.mean : Mean rate in phase bin
    • profile.var : Variance of rate in phase bin
    • profile.sdm : Standard deviation of the mean rate in a phase bin
    • profile.num : Number of data points in phase bin

  2. sitar_pfold_event( t, p, gti_lo, gti_hi [ ; pdot=#, pddot=#, nphs=#, tzero=#] )
    Fold a rate lightcurve on a given period (with optional first and second derivatives).
    Run as: isis> profile = sitar_pfold_rate(t,rate,p; pdot=#,pddot=#,nphs=#,tzero=#);
    Variables in [] are optional qualifier variables.
    Omitted qualifier variables take on default values.

    Inputs:
    • t : Times at which rates are measured
    • p : Period on which to fold the lightcurve
    • gti_lo : Array of lower boundaries of good time intervals
    • gti_hi : Array of lower boundaries of good time intervals
    Optional Qualifier Inputs:
    • pdot : Period derivative. Default=0.
    • pddot : Period second derivative. Default=0.
    • nphs : Number of phase bins in output folded lightcurve. Default = 20
    • tzero : Time of zero phase. Default = t[0]
    Outputs:
    • profile.bin_lo : Start value of phase bin
    • profile.bin_hi : Stop value of phase bin
    • profile.cts : Counts in phase bin
    • profile.var : Variance of rate in phase bin
    • profile.expos : Integrated exposure in phase bin

This page was last updated May 2, 2017 by Michael Nowak. To comment on it or the material presented here, send email to mnowak@space.mit.edu.
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