Skip to main content
Testing. You are viewing the public testing version of GCN. For the production version, go to
New Announcement Feature, Code of Conduct, Circular Revisions. See news and announcements

GCN Circular 26502

LIGO/Virgo S191205ah: AT2019wmy 10.4m GTC spectroscopy
2019-12-19T13:46:15Z (4 years ago)
Alberto J. Castro-Tirado at IAA-CSIC <>
Y.-D. Hu (IAA-CSIC), A. F. Valeev (SAO-RAS), A. J. Castro-Tirado and E. 
Fernandez-Garcia (IAA-CSIC), V. Sokolov (SAO-RAS), I. Carrasco and A. 
Castellon (UMA) and S. Geier (GRANTECAN, IAC, ULL), on behalf of a 
larger collaboration, report:

Following the detection of AT2019wmy/ZTF19acyiflj (Andreoni et al. GCNC 
26416) within the error area of the GW event S191205ah (LVC, GCNC 
26350), we obtained an optical spectrum covering the range 3700-7400 A 
with the 10.4m GTC telescope equipped with OSIRIS in La Palma (Spain) on 
Dec 18.

For AT2019wmy/ZTF19acyiflj, a magnitude r'= 19.79 +/- 0.05 at 06:35 UT 
is derived. The GTC spectrum is consistent with a SN Ia at redshift z = 
0.081 +/- 0.003.

Therefore we consider that AT2019wmy/ZTF19acyiflj is unrelated to the 
S191205ah GW alert.
Looking for U.S. government information and services? Visit