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Rapid Response Mode observations of GRB 160203A: Looking for fine-structure line variability at z=3.52
G. Pugliese, A. Saccardi, V. D Elia +26
Gamma-ray bursts are the most energetic known explosions. Despite fading rapidly, they allow to measure redshift and important properties of their host-galaxies. We report the phot…
The supernova of the MAGIC GRB190114C
A. Melandri, L. Izzo, E. Pian +42
We observed GRB190114C (redshift z = 0.4245), the first GRB ever detected at TeV energies, at optical and near-infrared wavelengths with several ground-based telescopes and the Hub…
Observation of inverse Compton emission from a long -ray burst
V. A. Acciari, S. Ansoldi, L. A. Antonelli +301
Long-duration gamma-ray bursts (GRBs) originate from ultra-relativistic jets launched from the collapsing cores of dying massive stars. They are characterised by an initial phase o…
GRB 190114C in the nuclear region of an interacting galaxy -- A detailed host analysis using ALMA, HST and VLT
A. de Ugarte Postigo, C. C. Thöne, S. Martın +28
GRB 190114C is the first GRB for which the detection of very-high energy emission up to the TeV range has been reported. It is still unclear whether environmental properties might…
GRB171010A / SN2017htp: a GRB-SN at z=0.33
A. Melandri, D. B. Malesani, L. Izzo +41
The number of supernovae known to be connected with long-duration gamma-ray bursts is increasing and the link between these events is no longer exclusively found at low redshift ($…
Are LGRBs biased tracers of star formation? Clues from the host galaxies of the /BAT6 complete sample of bright LGRBs III: Stellar masses, star formation rates and metallicities at
J. T. Palmerio, S. D. Vergani, R. Salvaterra +11
(Abridged) Long gamma-ray bursts (LGRB) have been suggested as promising tracers of star formation owing to their association with the core-collapse of massive stars. The goal of t…
Signatures of a jet cocoon in early spectra of a supernova associated with a -ray burst
L. Izzo, A. de Ugarte Postigo, K. Maeda +39
Long gamma-ray bursts mark the death of massive stars, as revealed by their association with energetic broad-lined stripped-envelope supernovae. The scarcity of nearby events and t…
Host galaxies of SNe Ic-BL with and without long gamma-ray bursts
J. Japelj, S. D. Vergani, R. Salvaterra +5
Broad-line Ic supernovae (SNe Ic-BL) are a very rare class of core-collapse supernovae exhibiting high ejecta velocities and high kinetic energies. They are the only type of SNe th…
Highly-ionized metals as probes of the circumburst gas in the natal regions of gamma-ray bursts
K. E. Heintz, D. Watson, P. Jakobsson +18
We present here a survey of high-ionization absorption lines in the afterglow spectra of long-duration gamma-ray bursts (GRBs) obtained with the VLT/X-shooter spectrograph. Our mai…
Colour variations in the GRB 120327A afterglow
A. Melandri, S. Covino, E. Zaninoni +42
We present a comprehensive temporal and spectral analysis of the long Swift GRB 120327A afterglow data to investigate the possible causes of the observed early time colour variatio…
The host galaxy of the short GRB111117A at : impact on the short GRB redshift distribution and progenitor channels
J. Selsing, T. Krühler, D. Malesani +26
It is notoriously difficult to localize short -ray bursts (sGRBs) and their hosts to measure their redshifts. These measurements, however, are critical to constrain the nature o…
Polarimetry and Photometry of Gamma-Ray Bursts with RINGO2
I. A. Steele, D. Kopac, D. M. Arnold +8
We present a catalog of early-time (~10^2-10^4s) photometry and polarimetry of all Gamma-Ray Burst (GRB) optical afterglows observed with RINGO2 imaging polarimeter on the Liverpoo…
The chemical enrichment of long-GRB nurseries up to z=2
S. D. Vergani, J. Palmerio, R. Salvaterra +12
We investigate the existence of a metallicity threshold for the production of long gamma-ray bursts (LGRBs). We used the host galaxies of the Swift/BAT6 sample of LGRBs. We conside…
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…
Taking stock of SLSN and LGRB host galaxy comparison using a complete sample of LGRBs
J. Japelj, S. D. Vergani, R. Salvaterra +2
Long gamma-ray bursts (LGRBs) and superluminous supernovae (SLSNe) are both explosive transients with very massive progenitor stars. Clues about the nature of the progenitors can b…
Are LGRBs biased tracers of star formation? Clues from the host galaxies of the Swift/BAT6 complete sample of bright LGRBs. II: star formation rates and metallicities at z < 1
J. Japelj, S. D. Vergani, R. Salvaterra +21
Long gamma-ray bursts (LGRBs) are associated with the deaths of massive stars and could thus be a potentially powerful tool to trace cosmic star formation. However, especially at l…
Limits on optical polarization during the prompt phase of GRB 140430A
D. Kopac, C. G. Mundell, J. Japelj +17
Gamma-ray burst GRB 140430A was detected by the Swift satellite and observed promptly with the imaging polarimeter RINGO3 mounted on the Liverpool Telescope, with observations begi…
GRB host galaxies with VLT/X-Shooter: properties at 0.8 < z < 1.3
S. Piranomonte, J. Japelj, S. D. Vergani +19
Long gamma-ray bursts (LGRBs) are associated with the death of massive stars. Their host galaxies therefore represent a unique class of objects tracing star formation across the ob…
The high-redshift gamma-ray burst GRB140515A
A. Melandri, M. G. Bernardini, P. D'Avanzo +22
High-redshift gamma-ray bursts have several advantages for the study of the distant universe, providing unique information about the structure and properties of the galaxies in whi…
Unveiling the population of orphan Gamma Ray Bursts
G. Ghirlanda, R. Salvaterra, S. Campana +12
Gamma Ray Bursts are detectable in the gamma-ray band if their jets are oriented towards the observer. However, for each GRB with a typical theta_jet, there should be ~2/theta_jet^…
Radio flares from gamma-ray bursts
D. Kopac, C. G. Mundell, S. Kobayashi +6
We present predictions of centimeter and millimeter radio emission from reverse shocks in the early afterglows of gamma-ray bursts with the goal of determining their detectability…
Spectrophotometric analysis of GRB afterglow extinction curves with X-shooter
J. Japelj, S. Covino, A. Gomboc +21
In this work we use gamma-ray burst (GRB) afterglow spectra observed with the VLT/X-shooter spectrograph to measure rest-frame extinction in GRB lines-of-sight by modeling the broa…
The nature of the late achromatic bump in GRB 120326A
A. Melandri, F. J. Virgili, C. Guidorzi +24
The long gamma-ray burst GRB 120326A at redshift exhibited a multi-band light curve with a striking feature: a late-time, long-lasting achromatic rebrighten…
Are LGRBs biased tracers of star formation? Clues from the host galaxies of the Swift/BAT6 complete sample of LGRBs. I: Stellar mass at z<1
S. D. Vergani, R. Salvaterra, J. Japelj +20
LGRBs are associated with massive stars and are therefore linked to star formation. The conditions necessary to produce LGRBs can affect the relation between the LGRB rate and star…