Light curves between 0.5 and 28 d in observer time for a radio (1.4 × 10⁹ Hz), optical (5 × 10¹⁴ Hz) and X-ray (5 × 10¹⁷ Hz) frequency, in each case both for a spherical explosion and a hard-edged jet with half-opening angle of 15°. Both the optical and X-ray curve lie above the cooling break ν_c. The radio jet break is postponed with respect to the others, at least by several days. The radio light curves change to a steeper rise around 25 d because ν_m is crossed before ν_a.