GCN Circular 27060
Subject
LIGO/Virgo S200213t: AT2020ciy/ZTF20aamvqxl, AT2020cjg/ZTF20aamvoxx and AT2020cje/ZTF20aamvtip 10.4m GTC spectroscopy
Event
Date
2020-02-13T23:06:46Z (6 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 and E.
Fernandez-Garcia (IAA-CSIC), V. Sokolov (SAO-RAS), I. Carrasco and A.
Castellon (UMA) and G. Lombardi (GRANTECAN, IAC, ULL), on behalf of a
larger collaboration, report:
Following the detection of AT2020ciy/ZTF20aamvqxl,
AT2020cjg/ZTF20aamvoxx and AT2020cje/ZTF20aamvtip (Kasliwal et al. GCNC
27051) within the error area of the GW event S200213t (LVC, GCNC 27042),
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
Feb 13, 20:08 UT. Details follow:
AT2020ciy/ZTF20aamvqxl, a magnitude r'=20.04 +/- 0.03 on 21:29UT is
derived. The GTC spectrum is consistent with a SNIa at redshift z =
0.1018 +/- 0.0005.
AT2020cjg/ZTF20aamvoxx, a magnitude r'=18.19 +/- 0.07 on 20:33UT is
derived. The GTC spectrum is consistent with a SNIa at redshift z =
0.097 +/- 0.005.
AT2020cje/ZTF20aamvtip, a magnitude r'=20.08 +/- 0.02 on 20:55UT is
derived. The GTC spectrum is consistent with a SNIa at redshift z =
0.1512 +/- 0.0005.
Therefore we consider that AT2020ciy/ZTF20aamvqxl,
AT2020cjg/ZTF20aamvoxx and AT2020cje/ZTF20aamvtip are unrelated to the
S200213t GW alert.