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srodney added x-ray text in main Results section
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a more complete description of the operations of the FrontierSN
program, see \citet{Rodney:2015a}.
\subsection{X-ray
Non-detections} Non-detections}\label{Xray}
The MACS0416 field was observed by the SWIFT X-Ray Telescope (XRT) and
UltraViolet/Optical Telescope (UVOT) in April 2013. No source was
...
Jones) on June 9, August 31, November 26, and December 17, 2014. These
Chandra images show no evidence for an x-ray emitting point source
near the \spock locations on those dates (S. Murray, private
communication).
The Chandra imaging collected on August 31, 2014
(MJD=56900) was coeval with the observed peak of IR emission from
the SE transient, \spocktwo, captured with HST. None of the other
X-ray imaging epochs coincided with \spock detections in optical or IR
wavelengths.
\subsection{Photometry}\label{sec:Photometry}
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Mira variables) that exhibit regular changes in flux due to pulsations
of the stellar photosphere. These variable stars do not exhibit sharp,
isolated transient episodes that could match the \spock light curve
shapes.
Stellar flares provide another very common source for optical
transient events, but the total energy released by even the most
extreme stellar flare falls far short of the observed energy release
from the \spock transients \citep{Balona:2012,Karoff:2016} .
We can also rule out active galactic nuclei (AGN), in which
brief transient episodes (a few days in duration) may be observed from
X-ray to infrared wavelengths \citep[e.g.][]{Gaskell:2003},
principally due to the quiescence of the \spock sources between the
two observed episodes and the absence of any of the broad emission
lines that are often (though not always) observed in AGN.
Stellar
flares provide another very common No x-ray
emitting point source
for optical transient
events, but the total energy released by even the most extreme stellar
flare falls far short was detected in 7 epochs of
imaging from
the
observed energy release Swift and Chandra x-ray space telescopes, collected from
2009 to
2014 (Methods~\ref{sec:Xray}). This includes the
\spock
transients \citep{Balona:2012,Karoff:2016} . Chandra imaging on
August 31, 2014 (MJD=56900), which was coeval with the peak
of IR emission from \spocktwo, observed with HST.
Many types of stellar explosions can generate isolated
transient events, and a useful starting point for classification of