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In order to discern the physical nature of many gamma-ray sources in the sky,we must look not only in spectral and spatial dimensions, but also understandtheir temporal variability. However, timing analysis of sources with a highlytransient nature, such as magnetar bursts, is difficult: standard Fouriertechniques developed for long-term variability generally observed, for example,from AGN often do not apply. Here, we present newly developed timing methodsapplicable to transient events of all kinds, and show their successfulapplication to magnetar bursts observed with Fermi/GBM. Magnetars are a primesubject for timing studies, thanks to the detection of quasi-periodicities inmagnetar Giant Flares and their potential to help shed light on the structureof neutron stars. Using state-of-the art statistical techniques, we search forquasi-periodicities (QPOs) in a sample of bursts from Soft Gamma Repeater SGRJ0501+4516 observed with Fermi/GBM and provide upper limits for potential QPOdetections. Additionally, for the first time, we characterise the broadbandvariability behaviour of magnetar bursts and highlight how this new informationcould provide us with another way to probe these mysterious objects.

New Methods for Timing Analysis of Transient Events, Applied to Fermi/GBM Magnetar Bursts