Spinning-off stringy electro-magnetic memories

We extend and generalise the string corrections to EM memory Type I superstring including spin effects. Very much as in simpler bosonic context, relevant are non-perturbative $\alpha'$, slowly decaying (as $1/R$) at large distances modulated retarded time $u=t-R$. For $N$ states first Regge trajectory they entail a sequence of derivatives wrt $u$ on `parent' $N=0$ amplitude. also briefly discuss how include loop effects, that broaden shift resonances, modify our analysis for macroscopic semi-classical quasi-BPS coherent states, whose collisions may lead detectable signals viable models.