GCN Circular 26405
Subject
LIGO/Virgo S191205ah: AT2019wfa 10.4m GTC spectroscopy
Date
2019-12-13T07:19:30Z (5 years ago)
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 R. Scarpa (GRANTECAN, IAC, ULL), on behalf of a
larger collaboration, report:
Following the detection of Gaia19fmm (AT2019wfa, Kostrzewa-Rutkowska et
al. GCNC 26397) 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)
starting on Dec 12, 21:00 UT.
For Gaia19fmm/AT2019wfa a magnitude r' = 18.01 +/- 0.02 on MJD
58829.8727669 is derived. The GTC spectrum is consistent with a SN Ia
3-4 days before maximum at redshift z = 0.0599 +/- 0.0005 derived from
the emission lines of the host galaxy.
Therefore we consider that Gaia19fmm/AT2019wfa is unrelated to the
S191205ah GW alert.