TITLE: GCN CIRCULAR NUMBER: 26830 SUBJECT: LIGO/Virgo S200114f: SOAR spectroscopy of AT2020zf, AT2020ace and AT2020ach DATE: 20/01/20 23:14:54 GMT FROM: Felipe Olivares E. at Millennium Institute of Astrophysics Regis Cartier (CTIO/OIR lab), Felipe Olivares (INCT/UDA), Ósmar Rodríguez (UNAB), Nicolás Meza-Retamal (ESO Chile), Jonathan Quirola (PUC), Juanita Antilen (U de Chile), Sahar Allam (Fermilab), Melissa Butner (ETSU), Douglas Tucker (Fermilab), Marcelle Soares-Santos (Brandeis U), Martin Makler (CBPF), Clecio R. Bom (CBPF), Luidhy Santana-Silva (Valongo Observatory), Clara Martinez-Vazquez (CTIO/OIR lab), 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), and Tamara Davis (U Queensland), on behalf of the DESGW team*: We report SOAR Goodman spectroscopy of AT2020zf, AT2020ace and AT2020ach, possible counterparts to the unmodeled GW event S200114f reported by the LVC in GCN Circular No. 26734. The candidates were found by ZTF (GCN Circular No. 26806). We obtained 1500, 2x1500 and 2x1500 sec exposures of AT2020zf, AT2020ace and AT2020ach, respectively, using the Goodman HTS instrument on the 4.1m SOAR telescope at Cerro Pachón. The SNID classifier analysis of these spectra allow us to conclude that: AT2020zf (ZTF20aafmdlx) is consistent with a Type Ia SN at a redshift of 0.136 (from host galaxy emission lines) around maximum. AT2020ace (ZTF20aafrviq) is similar to Type II (pec) SNe at a redshift of 0.096 (from host galaxy emission lines). The low signal-to-noise spectrum shows H-beta at ~5000 km/s on top of a blue continuum, however, H alpha appears only in emission. Further observations are encouraged. AT2020ach (ZTF20aafeaxv) is consistent with a Type Ic-BL at a redshift of 0.155 (from the SNID analysis) a few days before peak. The SOAR followup program is a partnership between the US (PIs: Kilpatrick & Tucker), Chilean (PI: Olivares), and Brazilian (PI: Makler) community. 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 Autónoma 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/OIR lab), 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 (CTIO/OIR lab), Alistair Walker (CTIO/OIR lab), Sara Webb (Swinburne U), Matt Wiesner (Benedictine U), Brian Yanny (Fermilab), Michitoshi Yoshida (NAOJ), Alfredo Zenteno (CTIO/OIR lab).