[vsnet-grb-info 22134] LIGO/Virgo S190425z: Keck NIR spectroscopy shows AT2019ebq is a supernova

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  24233
SUBJECT: LIGO/Virgo S190425z: Keck NIR spectroscopy shows AT2019ebq is a supernova
DATE:    19/04/26 16:12:30 GMT
FROM:    Kishalay De at Caltech, GROWTH  <kde at astro.caltech.edu>

J. Jencson (Caltech), K. De (Caltech), S. Anand (Caltech), M. M.
Kasliwal (Caltech), I. Andreoni (Caltech), T. Ahumada (UMD), D. A.
Perley (LJMU) report on behalf of the ZTF and GROWTH collaborations

We obtained near-IR spectroscopy of AT2019ebq (GCN #24210) with the
Near-Infrared Echellette Spectrometer (NIRES) on the Keck II Telescope
on Mauna Kea. The spectrum shows broad P Cygni supernova-like features
including He I (10830 A) with a velocity of approx. 14000 km/s,
suggesting that this is a Type Ib/IIb supernova. Thus, this object is
unrelated to LIGO/Virgo S190425z (GCN #24168).

We thank the staff of Keck observatory, especially Percy Gomez and
Julie Renaud-Kim, and the observer, Wanqiu He, for facilitating this
Target of Opportunity observation.