GCN Circular 25478
K. De, J. Jencson, M. M. Kasliwal, D. Goldstein, I. Andreoni (Caltech) report on behalf of the GROWTH (Global Relay of Observatories Watching Transients Happen) collaboration We further optimized the reduction of the Keck II NIRES spectrum of DG19wxnjc/AT2019npv (Goldstein et al. GCN 25393) reported earlier in De et al. GCN 25461. With better telluric correction, the He I 10830 line reported in our previous GCN is now more clearly identifiable with a P-Cygni profile at z=0.056 (Jonker et al. GCN 25454) and velocity of approximately 9000 km/s. This would be consistent with a stripped envelope supernova and thus, unrelated to LIGO/Virgo S190814bv (LVC et al. GCN 25324, GCN 25333). However, the observed faint luminosity of -15.75 mag (Annis et al. GCN 25458) suggests there could have been a brighter peak before discovery. We are grateful to the W. M. Keck Observatory staff, especially Greg Doppmann and Terry Stickel, for facilitating this partnership target of opportunity observation. We thank the observer Leslie Young for her kind co-operation.