[vsnet-grb-info 22153] SUBJECT: LIGO/Virgo S190425z: GRAWITA LBT spectroscopic observations

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  24252
SUBJECT: SUBJECT: LIGO/Virgo S190425z: GRAWITA LBT spectroscopic observations
DATE:    19/04/26 23:36:31 GMT
FROM:    Roberta Carini at INAF  <roberta.carini at inaf.it>

R. Carini (INAF-OAR), L. Izzo (IAA), E. Palazzi (INAF-OAS), D. Sand (U of
Arizona), A. Rossi (INAF-OAS), L. Cassará (INAF-IASF Mi), A. Gargiulo
(INAF-IASF Mi), P. D'Avanzo (INAF-OAB), A. Melandri  (INAF-OAB), L.
Tomasella (INAF – OAPd), S. Benetti (INAF – OAPd), M.T. Botticella
(INAF-OAC), M. Branchesi (GSSI), V. D'Elia (ASI-SSDC), E. Brocato
(INAF-OAAb, INAF-OAR), M. Della Valle (INAF – OACap), G. Greco (Univ.
Urbino), O. Kuhn (U of Arizona), I. Shivaei (U of Arizona), X. Fan (U of
Arizona), J. Andrews (U of Arizona), W.-F. Fong (Northwestern), K. Paterson
(Northwestern), M. Lundquist (U of Arizona), F. Cusano (INAF-OAS) on behalf
of GRAWITA report:



We observed the transient source AT2019ebq/PS19qp reported by Pan-STARRS
(Smith, et al., GCN 24210) within the skymap of the GW event S190425z (GCN
24168) with the two 8.4 m telescopes of the Large Binocular Telescope (LBT,
Mount Graham, Arizona) equipped with the MODS1 and MODS2 cameras in
spectroscopic mode. The observations started on 2019-04-26 at 11:00:44 UT.
Four optical spectra, lasting 600 s each, were obtained using the dual
grating (wavelength range ~ 320-1000 nm).

The combined spectrum has a low S/N. A classification attempt performed
with GELATO (Harutyunyan et al., 2008, A&A, 488, 383) shows that the
spectrum is similar to those of type Ib/c SNe few days after the maximum.
Our results are in agreement with the findings of Morokuma et al. (GCN
24230) and Jencson et al. (GCN 24233).



We thank the LBT team for the observations.