Epoch Folding

Function to find periodicities in time-data.

ef_search.periodic_generator(period=50, obs_length=1000, mean_countrate=10, pulsed_fraction=1.0)

Periodic events generator

Generates poisson sin-like data

Parameters

• period (float) – period of the signal.

• obs_length (float) – duration of observation.

• mean_countrate (float) – average counts per sec.

• pulsed_fraction (float) – from 0 to 1 - sin pulse fraction

Returns

generated periodic arrival times

Return type

array

ef_search.search(times, period_min, period_max, nbins=20, nperiods=1000)

Epoch folding

Calculate chi2 statistics for time-event data

Parameters

• times (array) – time-event data (photon arrival times).

• period_min (float) – starting period for search.

• period_max (float) – ending period for search.

Returns

array of calculated chi2 statistics

Return type

array