GCN Circular 25423

��smar Rodr��guez (UNAB), Nicol��s Meza-Retamal (ESO Chile), Jonathan Quirola
(PUC), Felipe Olivares (INCT/UDA), Regis Cartier (NOAO/CTIO), Douglas
Tucker (Fermilab), Marcelle Soares-Santos (Brandeis U), Clara
Martinez-Vazquez (NOAO/CTIO), Alyssa Garcia (Brandeis U), Ken Herner
(Fermilab), James Annis (Fermilab), Antonella Palmese (Fermilab), Nora
Sherman (Fermilab and Brandeis U), Robert Morgan (U of Wisconsin-Madison),
Tristan Bachmann (U Chicago), Tamara Davis (U Queensland)



On behalf of the DESGW team*:



We report SOAR Goodman spectroscopy of AT2019noq
Not found
 
 
 and AT2019ntn
Not found
 
 
, possible
counterparts to the black hole-neutron star merger S190814bv  reported by
the LVC in GCN Circulars No. 25324 and 25333. The candidates were found by
the Pan-STARRS1 telescope (GCN Circular No. 25356), by the DECam-Growth
team on CTIO Blanco DECam data (GCN Circular No. 25393), and independently
in  the DESGW analysis of the DECam data, respectively.



We obtained 1800 and 900 sec exposures of AT2019noq
Not found
 
 
 and AT2019ntn
Not found
 
 
,
respectively, using the Goodman instrument on the 4.1m SOAR telescope at
Cerro Pach��n. The SNID classifier analysis of these spectra allows us to
conclude that:



AT2019noq
Not found
 
 
 (PS19epf) is consistent with a Type IIP SN at a redshift of 0.07
a few days after peak.



AT2019ntn
Not found
 
 
 (DG19rtekc) is consistent with both a Type Ia-CSM SN and a Type
IIn SN at z=0.1.



The SOAR followup program is a partnership between the US (PIs: Tucker &
Kilpatrick), Chilean (PI: Olivares), and Brazilian (PI: Makler) community.
The optical counterpart was identified by the DECam Search & Discovery
Program for Optical Signatures of Gravitational Wave Events (DESGW, PI:
Soares-Santos), which is carried out by the Dark Energy Survey (DES)
collaboration in partnership with wide ranging groups in the community.
DESGW uses data obtained with the Dark Energy Camera (DECam), which was
constructed by the DES collaboration with support from the Department of
Energy and member institutions, and utilizes data as distributed by the
Science Data Archive at NOAO. NOAO is operated by the Association of
Universities for Research in Astronomy (AURA) under a cooperative agreement
with the National Science Foundation.



Based on observations obtained at the Southern Astrophysical Research
(SOAR) telescope, which is a joint project of the Ministerio da Ciencia,
Tecnologia, Inovacoes e Comunicacoes do Brasil (MCTIC/LNA), the U.S.
National Science Foundation's National Optical Astronomy Observatory
(NOAO), the University of North Carolina at Chapel Hill (UNC), and Michigan
State University (MSU).



*The DESGW Collaboration:



Sahar Allam (Fermilab), James Annis (Fermilab), Iair Arcavi (Tel Aviv U),
Tristan Bachmann (U Chicago), Paulo Barchi (INPE & Brandeis U), Thomas
Beatty (U of Arizona) Keith Bechtol (U of Wisconsin-Madison), Federico
Berlfein (Brandeis U), Antonio Bernardo (U of Sao Paulo), Dillon Brout (U
Penn), Robert Butler (Indiana U), Melissa Butner, (Fermilab), Annalisa
Calamida (STScI), Hsin-Yu Chen (Harvard U), Chris Conselice (U of
Nottingham), Carlos Contreras (STScI), Jeff Cooke (Swinburne U), Chris
D��������Andrea (U Penn), Tamara Davis (U Queensland), Reinaldo de Carvalho
(UNICSUL), H. Thomas Diehl (Fermilab), Zoheyr Doctor (U Chicago), Alex
Drlica-Wagner (Fermilab), Maria Drout (U Toronto), Maya Fishbach (U
Chicago), Francisco Forster (U de Chile), Ryan Foley (UCSC), Joshua Frieman
(Fermilab & U Chicago), Chris Frohmaier (U of Portsmouth), Ori Fox (STScI),
Alyssa Garcia (Brandeis U), Juan Garcia-Bellido (U Autonoma de Madrid),
Mandeep Gill (SLAC & Stanford U), Robert Gruendl (NCSA), Will Hartley (U
College London), Kenneth Herner (Fermilab), Daniel Holz (U Chicago), Jorge
Horvath (U of Sao Paulo), D. Andrew Howell (Las Cumbres Observatory),
Richard Kessler (U Chicago), Charles Kilpatrick (UCSC), Nikolay Kuropatkin
(Fermilab), Ofer Lahav (U College London), Huan Lin (Fermilab), Andrew
Lundgren (U of Portsmouth), Martin Makler (CBPF), Clara Martinez-Vazquez
(CTIO/NOAO), Curtis McCully (Las Cumbres Observatory), Mitch McNanna (U of
Wisconsin-Madison), Robert Morgan (U of Wisconsin-Madison), Gautham Narayan
(STScI), Eric Neilsen (Fermilab), Robert Nichol (U of Portsmouth),
Antonella Palmese (Fermilab), Francisco Paz-Chinchon (NCSA & UIUC), Matthew
Penny (OSU), Maria Pereira (Brandeis U), Sandro Rembold (UFSM), Armin Rest
(STScI & JHU), Livia Rocha (U Sao Paulo), Russell Ryan (STScI), Masao Sako
(U Penn), Samir Salim (Indiana U), David Sand (U of Arizona), Luidhy
Santana-Silva (Valongo Observatory), Daniel Scolnic (Duke U), Nora Sherman
(Fermilab), J. Allyn Smith (Austin Peay State U), Mathew Smith (U of
Southampton), Marcelle Soares-Santos (Brandeis U), Lou Strolger (STScI),
Riccardo Sturani (UFRN), Mark Sullivan (U of Southampton), Masaomi Tanaka
(NAOJ), Nozomu Tominaga (Konan U), Douglas Tucker (Fermilab), Yousuke
Utsumi (Stanford U), Stefano Valenti (UC Davis), Kathy Vivas (NOAO/CTIO),
Alistair Walker (NOAO/CTIO), Sara Webb (Swinburne U), Matt Wiesner
(Benedictine U), Brian Yanny (Fermilab), Michitoshi Yoshida (NAOJ), Alfredo
Zenteno (NOAO/CTIO).