[vsnet-grb-info 23054] LIGO/Virgo S190718y: Classification of AT 2019lqm / Gaia19dcs as a Type Ia Supernova

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  25153
SUBJECT: LIGO/Virgo S190718y: Classification of AT 2019lqm / Gaia19dcs as a Type Ia Supernova
DATE:    19/07/26 07:19:57 GMT
FROM:    Peter Jonker at SRON/RU  <p.jonker at sron.nl>

Kate Maguire (TCD), Mark Magee (TCD), Manuel Torres (IAC), Peter Jonker (SRON/Radboud
University), Morgan Fraser (UCD) report on behalf of the GW at WHT collaboration:

We obtained an optical spectrum of the transient AT2019lqm / Gaia19dcs
(discovered by Gaia within the probability map of S190718y; LIGO/Virgo
Collaboration GCN 25087, Kostrzewa-Rutkowska et al. GCN 25145) on 2019 July 25, 04:18
UT using the ACAM instrument mounted on the William Herschel Telescope located on the
Roque de Los Muchachos Observatory, La Palma, Spain. The exposure time was 1500 seconds.

Using SNID (Blondin & Tonry 2007, ApJ, 666, 1024) we find a good fit to normal
Type Ia supernovae at a redshift of z=0.066, about 1 week after peak.