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Target of Opportunity Observations of Gravitational Wave Events with LSST
R. Margutti, P. Cowperthwaite, Z. Doctor +79
The discovery of the electromagnetic counterparts to the binary neutron star merger GW170817 has opened the era of GW+EM multi-messenger astronomy. Exploiting this breakthrough req…
An embedded X-ray source shines through the aspherical AT2018cow: revealing the inner workings of the most luminous fast-evolving optical transients
Raffaella Margutti, B. D. Metzger, R. Chornock +41
We present the first extensive radio to gamma-ray observations of a fast-rising blue optical transient (FBOT), AT2018cow, over its first ~100 days. AT2018cow rose over a few days t…
One thousand days of SN 2015bn: HST imaging shows a light curve flattening consistent with magnetar predictions
Matt Nicholl, Peter K. Blanchard, Edo Berger +9
We present the first observations of a Type I superluminous supernova (SLSN) at days after maximum light. We observed SN 2015bn using the Hubble Space Telescope Adva…
Strongly Bipolar Inner Ejecta of the Normal Type IIP Supernova ASASSN-16at
Subhash Bose, Subo Dong, N. Elias-Rosa +24
We report distinctly double-peakedH-alpha and H-beta emission lines in the late-time, nebular-phase spectra (>~200 d) of the otherwise normal at early phases (<~ 100 d) Type IIP su…
SN 2014J in M82: New Insights On the Spectral Diversity of Type Ia Supernovae
Kaicheng Zhang, Xiaofeng Wang, JuJia Zhang +25
We present extensive spectroscopic observations for one of the closest type Ia supernovae (SNe Ia), SN 2014J discovered in M82, ranging from 10.4 days before to 473.2 days after B-…
AT 2017be - a new member of the class of Intermediate-Luminosity Red Transients
Y-Z. Cai, A. Pastorello, M. Fraser +20
We report the results of our spectrophotometric monitoring campaign for AT~2017be in NGC~2537. Its lightcurve reveals a fast rise to an optical maximum, followed by a plateau lasti…
Type II supernovae in low luminosity host galaxies
C. P. Gutiérrez, J. P. Anderson, M. Sullivan +29
We present an analysis of a new sample of type II core-collapse supernovae (SNe II) occurring within low-luminosity galaxies, comparing these with a sample of events in brighter ho…
Late-time observations of the extraordinary Type II supernova iPTF14hls
J. Sollerman, F. Taddia, I. Arcavi +22
We study iPTF14hls, a luminous and extraordinary long-lived Type II supernova, which lately has attracted much attention and disparate interpretation. We present new optical photom…
ASASSN-15no: The Supernova that plays hide-and-seek
S. Benetti, L. Zampieri, A. Pastorello +11
We report the results of our follow-up campaign of the peculiar supernova ASASSN-15no, based on optical data covering ~300 days of its evolution. Initially the spectra show a pure…
SNhunt151: an explosive event inside a dense cocoon
N. Elias-Rosa, S. Benetti, E. Cappellaro +20
SNhunt151 was initially classified as a supernova (SN) impostor (nonterminal outburst of a massive star). It exhibited a slow increase in luminosity, lasting about 450 d, followed…