Finding chart for GC Terzan 5. Black labels are variable stars studied in this work. Circled labels correspond to new discoveries and previously known variable stars, while labels in squares are the candidate variables. Blue labels are the 33 red giant stars studied in Origlia et al. (2011). The average FWHM obtained for the stars in the reference frame was about 0″.41. The big black square is the region explored in our study for new variable star detection and characterization, which corresponds to a field of view of about 38″ × 40″. Labeled stars lying outside the black box correspond to stars previously studied in the literature.