Abstract
We report an early photometric observation of the Type IIP supernova SN 2013ej taken 15 hours before the official discovery (CBET #3606). We observed the field of M74 on 2013 July 24.80 - 24.83 UT using the 1m telescope at the Lulin Observatory in Taiwan. The supernova 2013ej was clearly detected in our multi-color observations. By comparing with the USNO and GSC2.3 catalogs, we derived the following optical (B, V, and R) photometry: B=13.8, V=14.0, and R=14.3.