GCN Circular 25720
Subject
LIGO/Virgo S190910d: Liverpool Telescope spectroscopy of ZTF19abyfazm
Event
Date
2019-09-10T21:48:22Z (7 years ago)
From
Daniel Perley at Liverpool JMU <d.a.perley@ljmu.ac.uk>
D. A. Perley and C. M. Copperwheat (LJMU) report on behalf of the GROWTH
collaboration:
We acquired imaging and spectroscopy of ZTF19abyfazm/AT2019pwa (Anand et
al., GCN 25706), an optical transient within the error region of
gravitational wave trigger S190910d (LVC et al. GCN 25695), with the 2m
Liverpool Telescope. A sequence of 60-second images was acquired in g,
r, and i filters using IO:O, followed by 2x500s of spectroscopy with
SPRAT, between 20:53 and 21:20 on 2019-09-10 (UT).
The source remains bright and blue, although has faded slightly since
the time of ZTF discovery (we measure AB magnitudes of g=17.95, r=18.30,
i=18.65 at approximately MJD=58736.87). No significant absorption or
emission features are visible in the spectrum. We conclude that this
source is likely the eruption of an uncatalogued cataclysmic variable
within our Galaxy, although further monitoring will be needed to confirm
this.
We thank the MOPTOP commissioning team for their patience while
acquiring these observations.
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