GCN Circular 20757
Subject
LIGO/Virgo G275404: Keck spectrum of MASTER OT J105958.00-115756.5
Event
Date
2017-02-26T19:08:17Z (9 years ago)
From
Igor Andreoni at Swinburne U of Tech <igor.andreoni@gmail.com>
J. Cooke, I. Andreoni, U. Mestric (Swinburne Univ.), T. Moriya (NAOJ)
A spectrum of the MASTER transient OT J105958.00-115756.5 (GCN Circ. 20748) was taken with the Keck telescope on 2017-02-26.54 UT during the follow up of the LIGO event G275404 (LIGO/VIRGO Collaboration GCN Circ. 20738).
The observations were performed with the Low Resolution Imaging Spectrometer for a total exposure time of 2300s under several magnitudes of variable cloud extinction.
The preliminary analysis reveals a blue and mostly featureless spectrum at redshift z=0.0017. The spectrum shows evidence of Balmer series lines in absorption, with a potential weak emission in the H-gamma trough.
This result is not inconsistent with Lipunov et al. (GCN Circ. 20748), who suggest the event to be a CV.