TITLE:   GCN CIRCULAR
NUMBER:  24358
SUBJECT: LIGO/Virgo S190425z: Keck/MOSFIRE NIR spectroscopy of PS19qp (= AT 2019ebq)
DATE:    19/04/30 20:50:59 GMT
FROM:    Georgios Dimitriadis at UCSC  <gdimitri@ucsc.edu>

G. Dimitriadis, D. O. Jones, M. R. Siebert, J. S. Brown (UCSC),
I. Arcavi (Tel Aviv University), J. S. Bloom (UC Berkeley),
K. A. Bostroem (UC Davis), D. A. Coulter (UCSC), M. R. Drout (University of Toronto),
H. Ebeling (IfA-Hawaii), A. V. Filippenko (UC Berkeley), R. J. Foley (UCSC),
D. A. Howell (LCO/UCSB), T. Hung (UCSC), S. W. Jha (Rutgers), D. Kasen (UC Berkeley),
C. D. Kilpatrick (UCSC), A. L. Piro (Carnegie Obs.), J. X. Prochaska (UCSC),
E. Quataert (UC Berkeley), E. Ramirez-Ruiz (UCSC), A. G. Riess (STSci),
C. Rojas-Bravo (UCSC), D. J. Sand (UA), D. M. Scolnic (Duke), K. Siellez (UCSC),
S. Valenti (UC Davis) and W. Zheng (UC Berkeley).

We obtained near-IR spectroscopy of PS19qp (= AT 2019ebq) (GCN #24210), a proposed
counterpart to the gravitational wave event S190425z (GCN #24168), with the 
Multi-Object Spectrometer For Infra-Red Exploration (MOSFIRE) on the Keck I telescope
on Mauna Kea, starting at UT 2019-04-26 14:32:11, aproximately 1.2 days after
the LIGO/Virgo alert.

Our spectrum covers the J-band (1.15-1.35 microns). Visual inspection of the spectrum
indicates it is consistent with Type Ic supernovae a few days prior to maximum light,
similar to previous spectroscopic classifications (GCN #24230, GCN #24233, GCN #24252).

We thank the staff of Keck observatory, especially Josh Walawender,
for facilitating this Target of Opportunity observation.