Fig. 4
UVOT/uvm2 and XRT light curves of the NGC 4303-O1, identified as a Seyfert 1 galaxy (catalogued as 2XMM J122137.8+043025). The time zero is set to MET = 412217321 s (2014-01-24). The fit performed on the data with a constant function returns a mean UV flux (upper panel, aperture with radius = 5 arcsec) of 1.1 × 10-15 erg s-1 cm-2 A-1, χ2 = 242.8 (15 d.o.f.), and a null probability. The fit with a constant function on the X-ray data (lower panel) returns a mean rate of 1.06 × 10-2 counts s-1, χ2 = 39.15 (14 d.o.f.), and p = 0.0003.
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