Time dependence of the: i) bolometric luminosity of the object (black line), ii) X-rays in the 2−10 keV band (red line), and iii) optical in the 300−700 nm band (broken blue line). The black vertical line marks the X-ray (2−10 keV) flash occurrence about eight days after the maximum of the optical curve. Ṁ is taken from (14), with the following Ṁ₀: upper panel: Ṁ₀ = 10^-7 M_⊙/year, α = 0.1. Middle panel: Ṁ₀ = 3 × 10^-8 M_⊙/year, α = 0.3. Lower panel: Ṁ₀ = 10^-8 M_⊙/year, α = 0.3.