  The reliability of the first detection is one of the most interesting
challenges for the gravitational wave community. To increase the detection
confidence, the LIGO and Virgo collaborations have already started coincident
observations between gravitational waves detectors and other astronomical
instruments, like electromagnetic or neutrino detectors. This can be done in
two directions: searching for gravitational waves triggered by the
electromagnetic information, or pointing the electromagnetic telescopes to the
sky position given in real time by the gravitational wave analysis. The success
of the latter case depends strongly on the analysis speed of gravitational wave
pipelines to analyze data and extract any gravitational wave candidate with as
much information as possible. In this paper we discuss the case of the coherent
Waveburst pipeline, the main pipeline used in the past scientific LIGO-Virgo
analyses for the search of gravitational wave transients, reporting the
capability of making an all-sky and all-time analysis and the analysis speed
performance.
