UVOT/uvm2 light curve of the candidate eclipsing binary system NGC 2770-O1. The time zero is set to MET = 408372298 s (2013-12-10). The fit performed on the data with a constant function returns a mean flux of 6.6 × 10^-15 erg s^-1 cm^-2 A^-1. The fit provides a χ² = 147.1 (63 d.o.f.) and a probability p = 9 × 10^-11. The flux suddenly decreases by ~20% (red circle) and ~10% (green circle) with respect to the constant value. Both points were collected on May 20, 2014, in two different orbits of the Swift satellite. We found no X-ray counterpart to this source.