[vsnet-grb-info 24323] LIGO/Virgo S191205ah: AT2019wix and AT2019wib 10.4m GTC spectroscopy

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  26422
SUBJECT: LIGO/Virgo S191205ah: AT2019wix and AT2019wib 10.4m GTC spectroscopy
DATE:    19/12/14 09:25:02 GMT
FROM:    Alberto J. Castro-Tirado at IAA-CSIC  <ajct at 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 R. Scarpa (GRANTECAN, IAC, ULL), on behalf of a 
larger collaboration, report:

Following the detection of AT2019wix/ZTF19acxoywk and 
AT2019wib/ZTF19acxowrr (Andreoni et al. GCNC 26416) within the error 
area of the GW event S191205ah (LVC, GCNC 26350), we obtained optical 
spectra covering the range 3700-7400 A with the 10.4m GTC telescope 
equipped with OSIRIS in La Palma (Spain) on Dec 14. It is found that 
these two transients happened at the same distance. Details follow:

For AT2019wix/ZTF19acxoywk,a magnitude r'= 19.58 +/- 0.03 on 04:34UT is 
derived. The GTC spectrum is consistent with a SN Ib at redshift z = 
0.052 +/- 0.003, consistent with the redshift of the host galaxy derived 
from the emission lines (z = 0.0508 +/- 0.0005).

For AT2019wib/ZTF19acxowrr, a magnitude r'= 18.19 +/- 0.01 on 06:10UT is 
derived. The GTC spectrum is consistent with a SN IIp at redshift z = 
0.0509 +/- 0.0005.

Therefore we consider that AT2019wix/ZTF19acxoywk and 
AT2019wib/ZTF19acxowrr are unrelated to the S191205ah GW alert.