GCN Circular 26591
Subject
LIGO/Virgo S191213g: AT2019wxt 10.4m GTC further spectroscopy
Date
2019-12-26T09:37:08Z (5 years ago)
From
Alberto J. Castro-Tirado at IAA-CSIC <ajct@iaa.es>
A. F. Valeev (SAO-RAS), A. J. Castro-Tirado, Y.-D. Hu and E.
Fernandez-Garcia (IAA-CSIC), V. Sokolov (SAO-RAS), I. Carrasco and A.
Castellon (UMA), S. B. Pandey (ARIES) and N. Castro-Rodriguez
(GRANTECAN, IAC, ULL), on behalf of a larger collaboration, report:
McBrien et al. (GCN 26485) reported the intrinsically faint optical
transient PS19hgw (AT2019wxt) in the 80% probability contour of the
compact binary merger event S191213g (LVC, GCN 26402) and spectroscopic
observations were conducted by Izzo et al. (GCN 26491), Srivastav and
Smartt (GCN 26493), Muller Bravo et al. (GCN 26494), Vogl et al. (GCN
26504), Dutta et al. (GCN 26490), Vallely et al. (GCN 26508 ) and
Becerra-Gonzalez et al (GCN 26521).
We performed a first epoch of spectroscopic observations on Dec 18, 21
UT with the 10.4m GTC telescope (+ OSIRIS) in La Palma (Spain) covering
the range 3,700-10,000 A showing a blue continuum with broad shallow He
I lines. Following the report by Hubber et al. of a rapid optical decay
(GCNC 26577) a second epoch spectrum was obtained on Dec 24, 20 UT with
GTC and the same set-up. The 2nd epoch spectrum shows broad features at
~4,500 A and ~5,900A (rest frame) resembling pretty much those of the
SN2011fu (a type IIb SN) at about 25 days. Therefore, it seems certain
the classification of AT2019wxt as a type IIb SN. See
http://jet.sao.ru/~azamat/GW/PS19hgw2019-12-24T19:50.jpeg .
This work can be quoted.