Compilation of γ-ray flux measurements in Cas A from different instruments during the years 1992 to 2014 (see text). To each family of lines (low- and high-energy), an exponential decay function has been fitted, fixing the half-life time of ⁴⁴Ti to 86 a and the explosion date to AD 1671 (solid lines). The 1σ uncertainties are separately shown by dashed gray lines for each fit. The discrepancy can be expressed as a constant flux level of (2.29 ± 0.62) × 10^-5 ph cm^-2 s^-1.