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GCN Circular 25638

Subject
LIGO/Virgo S190901ap: Keck I LRIS spectroscopy of ZTF19abvionh
Date
2019-09-04T00:26:12Z (6 years ago)
From
Mansi M. Kasliwal at Caltech/Carnegie <mansikasliwal@gmail.com>
Kevin Burdge (Caltech), Mansi M. Kasliwal (Caltech), Daniel A. Perley (LJMU)

report on behalf of the GROWTH collaboration

We obtained a Keck I LRIS spectrum of ZTF19abvionh (Kool et al. GCN 25616).
We see a hot, blue continuum and host galaxy lines at z=0.0985. The
corresponding luminosity distance of 456 Mpc is inconsistent with the GW
constraints on S190901ap (LVC et al. GCN 25614, GCN 25606) suggesting this
could evolve into a young supernova. Our conclusions are broadly consistent
with Rossell et al. GCN 25622.
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