TITLE: GCN CIRCULAR NUMBER: 25206 SUBJECT: LIGO/Virgo S190728q: LCO Follow-Up of ZTF19abjethn (AT2019lvs) DATE: 19/07/28 20:43:25 GMT FROM: Michael Coughlin at Caltech/LIGO Tomas Ahumada (UMD) and Michael W. Coughlin (Caltech) on behalf of the Global Relay of Observatories Watching Transients Happen (GROWTH) collaboration. We used the 2-m telescope at the LCO node at Haleakala Observatory to obtain 180 second g,r, and i-band images for the ZTF optical transient ZTF19abjethn (AT2019lvs) listed in Kasliwal et al. (GCN 25199) starting at 14:50:26.164 UT on 2019-07-28. The measurements of this transient are consistent with a significant rise in the r-and g-band magnitudes reported by both Kasliwal et al. (GCN 25199), on top of the rise reported by Smartt et al. (GCN 25204), albeit in a different band. Magnitudes are derived after calibrating against PS1: u = 18.4 +- 0.1 g = 17.38 +- 0.03 r = 17.51 +- 0.04 i = 17.62 +- 0.04