{
  "bibcode": "2017GCN.20757....1C",
  "body": "J. Cooke, I. Andreoni, U. Mestric (Swinburne Univ.), T. Moriya (NAOJ)\n\n \n\nA 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).\n\n \n\nThe observations were performed with the Low Resolution Imaging Spectrometer for a total exposure time of 2300s under several magnitudes of variable cloud extinction.\n\n\n\nThe 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.  \n\n \n\nThis result is not inconsistent with Lipunov et al. (GCN Circ. 20748), who suggest the event to be a CV.",
  "circularId": 20757,
  "createdOn": 1488136097000,
  "email": "igor.andreoni@gmail.com",
  "subject": "LIGO/Virgo G275404: Keck spectrum of MASTER OT J105958.00-115756.5",
  "submitter": "Igor Andreoni at Swinburne U of Tech  <igor.andreoni@gmail.com>",
  "eventId": "LIGO/Virgo G275404"
}