[vsnet-grb-info 21993] LIGO/Virgo S190408an: MASTER OT J231043.63+470956.4 BOOTES-4 and 10.4m GTC follow-up observations
GCN Circulars
gcncirc at capella2.gsfc.nasa.gov
Wed Apr 10 23:18:46 JST 2019
TITLE: GCN CIRCULAR
NUMBER: 24092
SUBJECT: LIGO/Virgo S190408an: MASTER OT J231043.63+470956.4 BOOTES-4 and 10.4m GTC follow-up observations
DATE: 19/04/10 14:16:47 GMT
FROM: Alberto J. Castro-Tirado at IAA-CSIC <ajct at iaa.es>
A. F. Valeev, I. V. Sokolov and V. V. Sokolov (SAO-RAS), Y.-D. Hu, X.-Y.
Li and A. J. Castro-Tirado (IAA-CSIC), I. Carrasco (UMA), R.
Sanchez-Ramirez (INAF-IAPS), M. D. Caballero-Garcia (ASU-CAS) and P.
Peseev (GRANTECAN, IAC, ULL), on behalf of a larger collaboration, report:
Following the new optical transient MASTER OT J231043.63+470956.4
(Lipunov et al. GCNC 24084) within the LIGO/Virgo error box (GCNC
24069), we have followed it up with the BOOTES-4/MET 0.6m robotic
telescope in Lijiang (China) confirming its brightness (r = 15.3 mag on
Apr 9, 21UT). Furthermore, we have taken a 300s spectrum with the 10.4m
GTC (+OSIRIS) telescope in La Palma (Spain). The spectrum shows a blue
continuum with Balmer lines in absorption with the exception of H-alpha
in emission, all at zero redshift. This in consistent with a dwarf nova
spectrum undergoing a superoutburst, taking accound the > 7 mag
amplitude in optical brightness with respect to the quiescence phase.
Therefore this OT is unrelated to S190408an, in agreement with the Onori
et al. findings (GCNC 24090).
We acknowledge the excellent support from the GTC staff.
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