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The very short supersoft X-ray state of the classical nova M31N 2007-11a
M. Henze, W. Pietsch, G. Sala +9
Short supersoft X-ray source (SSS) states (durations < 100 days) of classical novae (CNe) indicate massive white dwarfs that are candidate progenitors of supernovae type Ia. We car…
Probing the complex environments of GRB host galaxies and intervening systems: high resolution spectroscopy of GRB050922C
S. Piranomonte, P. A. Ward, F. Fiore +20
The aim of this paper is to investigate the environment of gamma ray bursts (GRBs) and the interstellar matter of their host galaxies. We use to this purpose high resolution spectr…
The first two transient supersoft X-ray sources in M 31 globular clusters and the connection to classical novae
M. Henze, W. Pietsch, F. Haberl +12
Classical novae (CNe) have been found to represent the major class of supersoft X-ray sources (SSS) in our neighbour galaxy M 31. We determine properties and evolution of the two f…
SN 2006gy: was it really extra-ordinary?
I. Agnoletto, S. Benetti, E. Cappellaro +12
We present an optical photometric and spectroscopic study of the very luminous type IIn SN 2006gy for a time period spanning more than one year. In photometry, a broad, bright (M_R…
Type Ib Supernova 2008D associated with the Luminous X-ray Transient 080109: An Energetic Explosion of a Massive Helium Star
Masaomi Tanaka, Nozomu Tominaga, Ken'ichi Nomoto +11
We present a theoretical model for supernova (SN) 2008D associated with the luminous X-ray transient 080109. The bolometric light curve and optical spectra of the SN are modelled b…
GRB 080319B: A Naked-Eye Stellar Blast from the Distant Universe
J. L. Racusin, S. V. Karpov, M. Sokolowski +81
Long duration gamma-ray bursts (GRBs) release copious amounts of energy across the entire electromagnetic spectrum, and so provide a window into the process of black hole formation…
Measuring the cosmological parameters with the Ep,i-Eiso correlation of Gamma-Ray Bursts
L. Amati, C. Guidorzi, F. Frontera +4
We have used the Ep,i-Eiso correlation of GRBs to measure the cosmological parameter Omega_M. By adopting a maximum likelihood approach which allows us to correctly quantify the ex…
The Afterglows of Swift-era Gamma-Ray Bursts II.: Type I GRB versus Type II GRB Optical Afterglows
D. A. Kann, S. Klose, B. Zhang +21
We use a large sample of GRB afterglow and prompt-emission data (adding further GRB afterglow observations in this work) to compare the optical afterglows (or the lack thereof) of…
The Afterglows of Swift-era Gamma-Ray Bursts. I. Comparing pre-Swift and Swift era Long/Soft (Type II) GRB Optical Afterglows
D. A. Kann, S. Klose, B. Zhang +73
We have gathered optical photometry data from the literature on a large sample of Swift-era gamma-ray burst (GRB) afterglows including GRBs up to September 2009, for a total of 76…
The supernova rate in local galaxy clusters
F. Mannucci, D. Maoz, K. Sharon +4
We report a measurement of the supernova (SN) rates (Ia and core-collapse) in galaxy clusters based on the 136 SNe of the sample described in Cappellaro et al. (1999) and Mannucci…
A Light Echo from Type Ia Supernova 1995E?
J. L. Quinn, P. M. Garnavich, W. Li +4
We identify a light echo candidate from Hubble Space Telescope (HST) imaging of NGC 2441, the host galaxy of the Type Ia supernova 1995E. From the echo's angular size and the estim…
GRB 050223: A dark GRB in a dusty starburst galaxy
L. J. Pellizza, P. -A. Duc, E. Le Floc'h +19
Aims: We aim at detecting and determining the properties of the host galaxy of the dark GRB 050223. Methods: We use VLT optical/NIR images coupled to Swift X-ray positioning, and o…
UVES/VLT high resolution spectroscopy of GRB 050730 afterglow: probing the features of the GRB environment
V. D'Elia, F. Fiore, E. Meurs +44
We analyze high resolution spectroscopic observations of the optical afterglow of GRB050730, obtained with UVES@VLT about hours after the GRB trigger. The spectrum shows that the I…
The multiwavelength afterglow of GRB 050721: a puzzling rebrightening seen in the optical but not in the X-ray
L. A. Antonelli, V. Testa, P. Romano +27
Context. GRB050721 was detected by Swift and promptly followed-up, in the X-ray by Swift itself and, in the optical band, by the VLT operated, for the first time, in rapid response…
The shock break-out of GRB 060218/SN 2006aj
S. Campana, V. Mangano, A. J. Blustin +36
Although the link between long Gamma Ray Bursts (GRBs) and supernovae (SNe) has been established, hitherto there have been no observations of the beginning of a supernova explosion…
GRB 050904 at redshift 6.3: observations of the oldest cosmic explosion after the Big Bang
G. Tagliaferri, L. A. Antonelli, G. Chincarini +10
We present optical and near-infrared observations of the afterglow of the gamma-ray burst GRB 050904. We derive a photometric redshift z = 6.3, estimated from the presence of the L…
Gamma--Ray Bursts associated with Supernovae: A systematic analysis of BATSE GRB candidates
Z. Bosnjak, A. Celotti, G. Ghirlanda +2
We examined the properties of a sample of BATSE Gamma--Ray Bursts (GRBs) comprising events which have indications of association with a supernova (SN), some on the basis of indicat…
Optical emission from GRB 050709: a short/hard GRB in a star forming galaxy
S. Covino, D. Malesani, G. L. Israel +30
We present optical observations of the short/hard gamma-ray burst GRB 050709, the first such event with an identified optical counterpart. The object is coincident with a weak X-ra…
SN/GRB connection: a statistical approach with BATSE and Asiago Catalogues
S. Valenti, E. Cappellaro, M. Della Valle +3
Recent observations suggest that some types of GRB are physically connected with SNe of type Ib/c. However, it has been pointed out by several authors that some GRBs could be assoc…
Supernovae Shedding Light on Gamma-Ray Bursts
M. Della Valle
We review the observational status of the Supernova (SN)/Gamma-Ray Burst (GRB) connection. In section 2 we provide a short summary of the observational properties of core-collapse…
Evidence for Supernova Signatures in the Spectrum of the Late-time Bump of the Optical Afterglow of GRB 021211
M. Della Valle, D. Malesani, S. Benetti +14
We present photometric and spectroscopic observations of the gamma-ray burst GRB 021211 obtained during the late stages of its afterglow. The light curve shows a rebrightening occu…
The rate and the origin of type Ia supernovae in radiogalaxies
Massimo Della Valle, Nino Panagia
An analysis of type Ia supernova (SNIa) events in early type galaxies from Evans et al (1989) database provides strong evidence that the rate of type Ia supernovae (SNe) in radio-l…
The infrared supernova rate in starburst galaxies
F. Mannucci, R. Maiolino, G. Cresci +6
We report the results of our ongoing search for extincted supernovae (SNe) at near-infrared wavelengths. We have monitored at 2.2 micron a sample of 46 Luminous Infrared Galaxies a…
Nova Populations
Massimo Della Valle
In this article we review the current status of the stellar population assignment for novae. Observations in the Milky Way and in external galaxies point out the existence of two n…