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In this paper, we present extensive optical and ultraviolet (UV) observationsof the type Ia supernova (SN Ia) 2013gs discovered during the Tsinghua-NAOCTransient Survey. The photometric observations in the optical show that thelight curves of SN 2013gs is similar to that of normal SNe Ia, with an absolutepeak magnitude of $M_{B}$ = $-$19.25 $\pm$ 0.15 mag and a post-maximum declinerate $\Delta$m$_{15}$(B) = 1.00 $ \pm $ 0.05 mag. \emph{Gehrels Swift} UVOTobservations indicate that SN 2013gs shows unusually strong UV emission(especially in the $uvw1$ band) at around the maximum light (M$_{uvw1}$ $\sim$$-$18.9 mag). The SN is characterized by relatively weak Fe~{\sc ii} {\sc iii}absorptions at $\sim$ 5000{\AA} in the early spectra and a larger expansionvelocity ($v_{Si}$ $\sim$ 13,000 km s$^{-1}$ around the maximum light) than thenormal-velocity SNe Ia. We discuss the relation between the $uvw1-v$ color andsome observables, including Si~{\sc ii} velocity, line strength of Si~{\sc ii}$\lambda$6355, Fe~{\sc ii}/{\sc iii} lines and $\Delta m_{15}$(B). Compared toother fast-expanding SNe Ia, SN 2013gs exhibits Si and Fe absorption lines withsimilar strength and bluer $uvw1-v$ color. We briefly discussed the origin ofthe observed UV dispersion of SNe Ia.

Observations of A Fast-Expanding and UV-Bright Type Ia Supernova SN 2013gs