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Fig. A.1


Magnitude measurements for SDSS J102915+172927 from Asiago and La Palma. On the left column are shown the Asiago Schmidt telescope measurements versus time (in hours) for the night of 5 May 2011. Top panel, the 4 V magnitude compared to a linear combination of the SDSS g and r magnitudes. Bottom panel, the 4 R magnitude measurements calibrated vs. the SDSS r band. In both panels the respective SDSS magnitudes are shown as short dashed lines and 1σ errors (long-dashed lines). On the right column are shown the r band measurements of the WFC/INT on La Palma for the night of 10 March 2003.

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