Onset and maximum time determination for STEREO A observations of the 7 Mar. 2012 event. The increase in 55–105 keV electrons has been detected by the SEPT instrument in the Sun sector. The three horizontal lines mark (from left to right) the type III radio burst onset time (t_inj), the electron onset time (t_ons), and the electron maximum time (t_max) (cf. Table 2). The rise time of the event is the time from electron onset to electron maximum (Δt).