[vsnet-grb-info 24975] LIGO/Virgo S200213t: DBSP spectroscopy of AT2020cjb/ZTF20aamvnth, AT2020cja/ZTF20aamvmzj, AT2020cjc/ZTF20aamvoeh
GCN Circulars
gcncirc at capella2.gsfc.nasa.gov
Sat Feb 15 11:20:05 JST 2020
TITLE: GCN CIRCULAR
NUMBER: 27074
SUBJECT: LIGO/Virgo S200213t: DBSP spectroscopy of AT2020cjb/ZTF20aamvnth, AT2020cja/ZTF20aamvmzj, AT2020cjc/ZTF20aamvoeh
DATE: 20/02/15 02:17:15 GMT
FROM: Anna Ho at Caltech <annayqho at gmail.com>
Anna Y. Q. Ho and Andy Tzanidakis (Caltech) report on behalf of the GROWTH
collaboration:
On 2020-02-14 UT we obtained spectroscopy of three of the reported ZTF
optical transients (Kasliwal et al. GCN 27051) inside the error region of
S200213t (LVC,GCN #27042) using the Double Beam Spectrograph on the
200-inch Hale Telescope at Palomar Observatory. We used SNID to make
preliminary classifications.
The spectrum of AT2020cjb/ZTF20aamvnth shows a broad emission feature
consistent with H-alpha at the host redshift of z=0.06, corroborating the
SN II classification reported in Castro-Tirado et al. GCN #27063.
The spectrum of AT2020cjc/ZTF20aamvoeh is a match to a type Ia SN at z~0.14
close to maximum light.
The spectrum of AT2020cja/ZTF20aamvmzj has a blue continuum and a broad
emission feature around 5600AA.
Observations of additional sources are ongoing.
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