TITLE:   GCN CIRCULAR
NUMBER:  26502
SUBJECT: LIGO/Virgo S191205ah: AT2019wmy 10.4m GTC spectroscopy
DATE:    19/12/19 13:46:15 GMT
FROM:    Alberto J. Castro-Tirado at IAA-CSIC  <ajct@iaa.es>

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.