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Fig. B.1


Sequence of eight sub-frame images taken a few minutes after the event (between 03:43:54 and 03:44:02 UT). In each frame, the target star is circled in red and the guide and calibration stars are circled in yellow and green, respectively. Because of the tracking correction (due to imprecise telescope tracking), the stars move abruptly on the CCD during the exposure at 03:44:55 (the sub-frame only shows the minutes and seconds). The green arrows point towards the real stellar positions. Inthe 03:43:57 exposure, we see phantoms of the dimmest stars (remnants from the previous exposures), which are shown by the white arrows. These phantoms are seen for at least five images, up to the 03:44:01 exposure.

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