Difference: GCNCIRCULAR20757 ( vs. 1)

Revision 12017-02-27 - ThomasKupfer

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META TOPICPARENT	name="LVCGCNs"

TITLE: GCN CIRCULAR
NUMBER: 20757
SUBJECT: LIGO/Virgo G275404: Keck spectrum of MASTER OT J105958.00-115756.5
DATE: 17/02/26 19:08:17 GMT
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.

-- ThomasKupfer - 27 Feb 2017

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