Minimum u-band apparent AB magnitudes (i.e., at peak brightness) and the corresponding peak times for selected magnetars in Table 2. A fixed magnetar mass of 1.4 M_⊙ was adopted. Different symbols represent different magnetars. Among the EOSs considered in this work, the stiffest (H4) and softest (WFF) are indicated by red and blue labels, respectively. The limiting magnitudes as functions of exposure time for different telescopes have been overplotted for UVOT, WFST, LSST, and CSST. The region above each line corresponds to the detectable parameter space.