  In this letter, we report the structural, elastic, and quasiparticle band
structure of cynauric triazide. The structural properties using a dispersion
corrected method to treat van der Waals (vdW) forces offers a significant
improvement in the description of the ground state properties. The predicted
bulk modulus from the equation of state and the elastic constants are
consistent and the magnitude lies in the order of secondary explosives. Then,
the G$_0$W$_0$ approximation is used to study the band structure and an
indirect band gap of 6.33 eV is obtained. Finally, we have calculated the
optical and detonation characteristics at ambient pressure.
