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\section{Gaia as a Transient Search Machine} Gaia is comparable to other transient search machines, such as the Catalina Sky Survey and the Palomar Transient Factory, as shown in Table~\ref{transient_machine}, which similar areas covered each day and similar limiting magnitude. The disadvantage of the Gaia survey is that the average cadence is only $\sim$30days whereas transient surveys usually have a cadence of approximately 3 to 5 days. However, there is also a shorter cadence of 105.6m from the two mirrors in the satellite. This 105.6m cadence is a huge advantage and means that changes in brightness should be detected quickly. Also, Gaia will cover the whole sky (including the Galactic plane), which is a significant survey area increase over other transient searches. The Gaia transient alerts will also have high spatial resolution with precise photometry (1$\%$ at G=19) and milliarcsecond astrometry (down to $\sim$20mag) and lowres spectra for all objects brighter than $\sim$19mag and colors for fainter objects (see \cite{Jordi} \cite{ude_Vallenari_Kohley_Mora_2010}\cite{Jordi}  for details of the photometry and lowres spectra). \begin{center} \begin{tabular}{c|c|c|c} Patient & Gaia & Catalina Sky Survey & Palomar Transient Factory\\ \hline deg2 day-1 & ***INVALID BYTE SEQUENCE HERE******INVALID BYTE SEQUENCE HERE***$\sim$1230 & 1500 & 1000\\ Avg Cadence & $\sim$ ***INVALID BYTE SEQUENCE HERE******INVALID BYTE SEQUENCE HERE***30 days & 14 days & 5 days \\ Limiting mag & 20 (21?) & 19.5 & 21 \\ fsky & all sky & 0.6 & 0.2\\ \end{tabular} \caption{Predicted numbers for the Gaia transient search compared to some ongoing surveys.} \label{transient_machine} \end{center}