GCN Circular 26382
Subject
LIGO/Virgo S191205ah: MASTER OT 1.5m OSN imaging and 10.4m GTC spectroscopy
Date
2019-12-08T07:13:28Z (5 years ago)
From
Alberto J. Castro-Tirado at IAA-CSIC <ajct@iaa.es>
A. F. Valeev (SAO-RAS), Y.-D. Hu, A. J. Castro-Tirado, F. J. Aceituno
and E. Fernandez-Garcia (IAA-CSIC), V. Sokolov (SAO-RAS), I. Carrasco
and A. Castellon (UMA) and N. Castro-Rodriguez (GRANTECAN, IAC, ULL), on
behalf of a larger collaboration, report:
Following the detection of MASTER OT J123123.61-043847.2 (Lipunov al.
GCNC 26379, Murata et al. GCN 26381) within the error area of the GW
event S191205ah (LVC, GCNC 26350), we obtained imaging at the 1.5m OSN
telescope in Granada (Spain) and optical spectra covering the range
3700-10000 A with the 10.4m GTC telescope equipped with OSIRIS in La
Palma (Spain)
starting on Dec 8, 05:20 UT.
For MASTER OT J123123.61-043847.2 a magnitude r' = 17.9 on Dec 8, 05:20
UT is derived. The GTC spectrum is consistent with a type Ia SN at
redshift z = 0.056 +/- 0.003, implying an absolute optical magnitude
close to the expected absolute magnitude at peak of type Ia SNe (M_V =
-19.3).
Therefore we consider that MASTER OT J123123.61-043847.2 is unrelated to
the S191205ah GW alert.