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Seven years of coordinated Chandra-NuSTAR observations of SN2014C unfold the extreme mass-loss history of its stellar progenitor
Daniel Brethauer, Raffaella Margutti, Danny Milisavljevic +13
We present the results from our seven-year long broad-band X-ray observing campaign of SN\,2014C with \emph{Chandra} and \emph{NuSTAR}. These coordinated observations represent the…
SN 2014C: VLBI image shows a shell structure and decelerated expansion
Michael F. Bietenholz, Norbert Bartel, Atish Kamble +3
We report on new Very Long Baseline Interferometry radio measurements of supernova 2014C in the spiral galaxy NGC 7331, made with the European VLBI Network ~5 yr after the explosio…
Constraints on the environment and energetics of the Broad-Line Ic SN2014ad from deep radio and X-ray observations
M. Marongiu, C. Guidorzi, R. Margutti +3
Broad-line type Ic Supernovae (BL-Ic SNe) are characterized by high ejecta velocity ( km s) and are sometimes associated with the relativistic jets typical of…
The luminous host galaxy, faint supernova and rapid afterglow rebrightening of GRB 100418A
A. de Ugarte Postigo, C. C. Thoene, K. Bensch +35
Long gamma-ray bursts give us the chance to study both their extreme physics and the star-forming galaxies in which they form. GRB 100418A, at a z = 0.6239, had a bright optical an…
ThunderKAT: The MeerKAT Large Survey Project for Image-Plane Radio Transients
R. Fender, P. A. Woudt, R. Armstrong +59
ThunderKAT is the image-plane transients programme for MeerKAT. The goal as outlined in 2010, and still today, is to find, identify and understand high-energy astrophysical process…
A VLA Study of High-redshift GRBs II - The Complex Radio Afterglow of GRB 140304A: Shell Collisions and Two Reverse Shocks
Tanmoy Laskar, Edo Berger, Raffaella Margutti +6
We present detailed multi-frequency, multi-epoch radio observations of GRB 140304A at from 1 to 86 GHz and 0.45 d to 89 d. The radio and mm data exhibit unusual multiple…
SN 2014C: VLBI Images of a Supernova Interacting with a Circumstellar Shell
Michael F. Bietenholz, A. Kamble, R. Margutti +2
We report on VLBI measurements of supernova 2014C at several epochs between and 1057 days after the explosion. SN 2014C was an unusual supernova that initially had Type I…
iPTF15eqv: Multi-wavelength Exposé of a Peculiar Calcium-rich Transient
D. Milisavljevic, D. Patnaude, J. Raymond +15
The progenitor systems of the class of "Ca-rich transients" is a key open issue in time domain astrophysics. These intriguing objects exhibit unusually strong calcium line emission…
Point-source and diffuse high-energy neutrino emission from Type IIn supernovae
Maria Petropoulou, Stefan Coenders, Georgios Vasilopoulos +2
Type IIn supernovae (SNe), a rare subclass of core collapse SNe, explode in dense circumstellar media that have been modified by the SNe progenitors at their last evolutionary stag…
Results from a systematic survey of X-ray emission from Hydrogen-poor Superluminous Supernovae
Raffaella Margutti, R. Chornock, B. D. Metzger +11
We present the results from a sensitive X-ray survey of 26 nearby hydrogen-poor superluminous supernovae (SLSNe-I) with Swift, Chandra and XMM. This dataset constrains the SLSN evo…
The Nearby Type Ibn Supernova 2015G: Signatures of Asymmetry and Progenitor Constraints
Isaac Shivvers, WeiKang Zheng, Schuyler D. Van Dyk +24
We present the results of an extensive observational campaign on the nearby Type Ibn SN 2015G, including data from radio through ultraviolet wavelengths. SN 2015G was asymmetric, s…
GRB 110715A: The peculiar multiwavelength evolution of the first afterglow detected by ALMA
R. Sánchez-Ramírez, P. J. Hancock, G. Jóhannesson +35
We present the extensive follow-up campaign on the afterglow of GRB 110715A at 17 different wavelengths, from X-ray to radio bands, starting 81 seconds after the burst and extendin…
X-rays from the location of the Bactrian Transient ASASSN-15lh
R. Margutti, B. D. Metzger, R. Chornock +13
We present the detection of persistent soft X-ray radiation with L_x ~ 10^41-10^42 erg/s at the location of the extremely luminous, double-humped transient ASASSN-15lh as revealed…
The second closest gamma-ray burst: sub-luminous GRB 111005A with no supernova in a super-solar metallicity environment
Michał J. Michałowski, Dong Xu, Jamie Stevens +17
We report the detection of the radio afterglow of a long gamma-ray burst (GRB) 111005A at 5-345 GHz, including the very long baseline interferometry observations with the positiona…
Radio synchrotron emission from secondary electrons in interaction-powered supernovae
Maria Petropoulou, Atish Kamble, Lorenzo Sironi
Several supernovae (SNe) with an unusually dense circumstellar medium (CSM) have been recently observed at radio frequencies. Their radio emission is powered by relativistic electr…
Electromagnetic Counterparts of Gravitational Wave Sources : Mergers of Compact Objects
Atish Kamble, David L. A. Kaplan
Mergers of compact objects are considered prime sources of gravitational waves (GW) and will soon be targets of GW observatories such as the Advanced-LIGO, VIRGO etc. Finding elect…
Ejection of the massive Hydrogen-rich envelope timed with the collapse of the stripped SN2014C
Raffaella Margutti, A. Kamble, D. Milisavljevic +19
We present multi-wavelength observations of SN2014C during the first 500 days. These observations represent the first solid detection of a young extragalactic stripped-envelope SN…
Metamorphosis of SN 2014C: Delayed Interaction Between a Hydrogen Poor Core-collapse Supernova and a Nearby Circumstellar Shell
D. Milisavljevic, R. Margutti, A. Kamble +19
We present optical observations of supernova SN 2014C, which underwent an unprecedented slow metamorphosis from H-poor type Ib to H-rich type IIn over the course of one year. The o…
A Deep Search for Prompt Radio Emission from Thermonuclear Supernovae with the Very Large Array
Laura Chomiuk, Alicia M. Soderberg, Roger A. Chevalier +10
Searches for circumstellar material around Type Ia supernovae (SNe Ia) are one of the most powerful tests of the nature of SN Ia progenitors, and radio observations provide a parti…
The Double-Peaked SN2013ge: a Type Ib/c SN with an Asymmetric Mass Ejection or an Extended Progenitor Envelope
M. R. Drout, D. Milisavljevic, J. Parrent +17
We present extensive observations of the Type Ib/c SN2013ge from -13 to +457 days, including spectra and Swift UV-optical photometry beginning 2-4 days post-explosion. This data se…
Radio and X-rays From SN 2013df Enlighten Progenitors of Type IIb Supernovae
Atish Kamble, Raffaella Margutti, Alicia M. Soderberg +7
We present radio and X-ray observations of the nearby Type IIb Supernova 2013df in NGC4414 from 10 to 250 days after the explosion. The radio emission showed a peculiar soft-to-har…
Dust in the wind: the role of recent mass loss in long gamma-ray bursts
Raffaella Margutti, C. Guidorzi, D. Lazzati +6
We study the late-time (t>0.5 days) X-ray afterglows of nearby (z<0.5) long Gamma-Ray Bursts (GRB) with Swift and identify a population of explosions with slowly decaying, super-so…
The Broad-Lined Type Ic SN 2012ap and the Nature of Relativistic Supernovae Lacking a Gamma-ray Burst Detection
D. Milisavljevic, R. Margutti, J. T. Parrent +20
We present ultraviolet, optical, and near-infrared observations of SN 2012ap, a broad-lined Type Ic supernova in the galaxy NGC 1729 that produced a relativistic and rapidly decele…
No X-rays from the very nearby Type Ia SN2014J: constraints on its environment
R. Margutti, J. Parrent, A. Kamble +5
Deep X-ray observations of the post-explosion environment around the very nearby Type Ia SN\,2014J (Dl=3.5 Mpc) reveal no X-ray emission down to a luminosity L<7x10^{36} erg/s (0.3…