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In FRETBursts the user can choose arbitrary photon streams as input, an in general  we call this kind of search AND-gate burst search.  Aftereach  burst search, it is necessary to select bursts having a minimum number of photons (burst size). In the most  basic form, this selection can be performed during burst search by discarding  bursts with size smaller than a threshold $L$, as originally proposed by 
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of background and γ factor on the burst size and can lead to a selection  bias of certain channels and/or sub-populations.  For this reason we suggest performing a burst size selection after background  correction,possibly  taking into account the γ factor, as discussed in sections~\ref{sec:burstsizeweights} and~\ref{sec:burstsel}.  In special situations, case,  users can also choose to replace this size or combine   the burst  selection based on burst size  with another criterion such as burst duration or brightness. brightness (see section~\ref{sec:}).  \subsection{γ-corrected Burst Sizes and Weights}  \label{sec:burstsizeweights}