GCN Circular 18573
Subject
LIGO/Virgo G194575: Liverpool Telescope observations of iPTF-15dld and iPTF-15dni
Date
2015-11-10T11:35:56Z (9 years ago)
From
Iain Steele at Liverpool/JMU <i.a.steele@ljmu.ac.uk>
I.A. Steele, C.M. Copperwheat, A.S. Piascik (Liverpool JMU) report on behalf
of a larger collaboration:
We report Liverpool Telescope (La Palma) observations of iPTF-15dld and iPTF-15dni.
SPRAT Spectroscopy and IO:O broad band optical photometry of iPTF-15dld was obtained on the
night of 2015-11-06. ��Interpolating over the host galaxy emission lines in the spectrum reveals
a continuum with broad emission features. ��With the data to hand we are
not confident in subtraction of the host galaxy continuum from that of the transient. ��The
spectrum is broadly consistent with the identification made as a Type Ic broad line
supernova in GCN18632 but we are not able to constrain the redshift or age. ��Depending
on observation priorities we may schedule some further spectroscopy and photometry
at later times.
SPRAT Spectroscopy and IO:O redshifted H-alpha optical imaging of iPTF-15dni
was obtained on the night of 2015-11-05. ��Comparison of the spectrum with our
earlier spectrum obtained on 2015-10-28 and reported in GCN18549 shows no
significant change in the H-alpha emission line. ��Our H-alpha images show the galaxy
has many apparent star forming regions, although we can not resolve the location of the��
transient in H-alpha from the galaxy core without a reference image at this time. ����
Depending on observation priorities we may schedule some further spectroscopy��
and photometry at later times.
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