Animation of the impact I detected (and confirmed with further two independent observations) with high contrast/enlargment and with a slow motion in 8 fps. TMB 13 cm Mintron camera (low gain, gamma 1 and 25 fps) August 1, 2013 at 02:21:55.640 UT from Rome Italy.
Original AVI (segment at the impact time shown at 4 fps and at 25 fps). Further data are reported below