GCN Circular 25484
Subject
LIGO/Virgo S190814bv: SOAR spectroscopy of DECam candidates AT2019npw and AT2019num
Event
Date
2019-08-27T07:50:35Z (7 years ago)
From
Douglas Tucker at Fermilab <dtucker@fnal.gov>
LIGO/Virgo S190814bv: SOAR spectroscopy of DECam candidates AT2019npw and AT2019num
Douglas Tucker (Fermilab), Melissa Butner (ETSU), Matt Wiesner (Benedictine U), ��smar Rodr��guez (UNAB), Nicol��s Meza-Retamal (ESO Chile), Jonathan Quirola (PUC), Felipe Olivares (INCT/UDA), Sean Points (NOAO/CTIO), Regis Cartier (NOAO/CTIO), Sahar Allam (Fermilab), Marcelle Soares-Santos (Brandeis U), Clara Martinez-Vazquez (NOAO/CTIO), Alyssa Garcia (Brandeis U), Ken Herner (Fermilab), James Annis (Fermilab), Martin Makler (CBPF), Antonella Palmese (Fermilab), Nora Sherman (Fermilab and Brandeis U), Robert Morgan (U of Wisconsin-Madison), Tristan Bachmann (U Chicago), Tamara Davis (U Queensland), Kristen Dage (MSU), Adam Kawash (MSU), Jay Strader (MSU), Laura Chomiuk (MSU)
On behalf of the DESGW team*:
We report SOAR Goodman spectroscopy of AT2019npw and AT2019num, possible counterparts to the black hole-neutron star merger S190814bv reported by the GROWTH team (GCN Circulars No. GCN 25362, 25393, 25394) based on data obtained by the DESGW team using the CTIO Blanco/DECam instrument.
We obtained a 45 min exposure of 2019npw and a 10 min exposure of 2019num using the Goodman instrument on the 4.1m SOAR telescope at Cerro Pach��n. The analysis of these spectra allow us to conclude that both candidates are unrelated to the merger:
2019npw is consistent with a type IIb supernova at redshift 0.163
2019num is consistent with a type IIP supernova at redshift 0.113
The SOAR followup program is a partnership between the US (PIs: Kilpatrick & Tucker), 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 (ETSU), 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 Soar
es-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).