Kocevski, Daniel, Thone, Christina C, Ramirez-Ruiz, Enrico, Bloom, Joshua S., Granot, Jonathan, Butler, Nathaniel R., ...
We present results of an extensive observing campaign of the short duration, hard spectrum gamma-ray burst (GRB) 070724A, aimed at detecting the radioactively-powered emission that might follow from...
MAGIC observation of GRB080430 (2009)
Covino, Stefano, Garczarczyk, Markus, Gaug, Markus, Antonelli, Angelo, Bastieri, Denis, Becerra-Gonzalez, Josefa, ...
Gamma-ray bursts are cosmological sources emitting radiation from the gamma-rays to the radio band. Substantial observational efforts have been devoted to the study of GRBs during the prompt phase,...
MAGIC observation of GRB090102 (2009)
Gaug, Markus, Covino, Stefano, Garczarczyk, Markus, Antonelli, Angelo, Bastieri, Denis, La Barbera, Antonio, ...
On January 2, the MAGIC-I Telescope observed GRB090102 (z=1.55) under particularly good observation conditions. Using the recently upgraded MAGIC-1 sum trigger system, upper limits down to below 50...
GRB Observations with the MAGIC Telescopes (2009)
Garczarczyk, Markus, Gaug, Markus, Antonelli, Angelo, Bastieri, Denis, Becerra-Gonzalez, Josefa, Covino, Stefano, ...
MAGIC is currently the most suitable instrument to perform observations of the prompt an early afterglow emission from Gamma Ray Bursts (GRBs) at energies above 25 GeV. The instrument is designed to...
GRB Afterglow Polarimetry: Past, Present and Future (2009)
Gamma-ray bursts and their afterglows are thought to be produced by an ultrarelativistic jet. One of the most important open questions is the outflow composition: the energy may be carried out from...
Bloom, Joshua S., Holz, Daniel E., Hughes, Scott A., Menou, Kristen, Adams, Allan, Anderson, Scott F., ...
It is widely expected that the coming decade will witness the first direct detection of gravitational waves (GWs). The ground-based LIGO and Virgo GW observatories are being upgraded to advanced...
Vrijhk Photometry of PKS 0537-441 and PKS 2155-304 in 2006-2008 (2008)
Impiombato, Domenico, Tosti, Gino, Treves, Aldo, Covino, Stefano, Pian, Elena, Ciprini, Stefano
We report the 2006-2008 light curves obtained with the REM telescope in VRIJHK bands for the two BL Lac objects PKS 0537-441 and PKS 2155-304
Mazzali, Paolo A., Valenti, Stefano, Della Valle, Massimo, Chincarini, Guido, Sauer, Daniel N., Benetti, Stefano, ...
The only supernovae (SNe) to have shown early gamma-ray or X-ray emission thus far are overenergetic, broad-lined Type Ic SNe (Hypernovae - HNe). Recently, SN 2008D shows several novel features: (i)...
Mazzali, Paolo A., Valenti, Stefano, Della Valle, Massimo, Chincarini, Guido, Sauer, Daniel N., Benetti, Stefano, ...
Achromatic breaks for Swift GRBs: Any evidence? (2007)
Covino, Stefano, Malesani, Daniele, Tagliaferri, Gianpiero, Vergani, Susanna D., Chincarini, Guido, Kann, D.A., ...
The availability of multi-wavelength high-quality data of gamma-ray burst afterglows in the Swift era, contrary to the expectations, did not allow us to fully confirm yet one of the most fundamental...
Swift GRBs: The early afterglow spectral energy distribution (2007)
Tagliaferri, Gianpiero, Malesani, Daniele, Vergani, Susanna D., Campana, Sergio, Chincarini, Guido, Covino, Stefano, ...
We present the first results of a program to systematically study the optical-to-X-ray spectral energy distribution (SED) of Swift GRB afterglows with known redshift. The goal is to study the...
Discovery of the optical afterglow of XRF 040812: VLT and Chandra observations (2007)
D'Avanzo, Paolo, Malesani, Daniele, Campana, Sergio, Covino, Stefano, Moretti, Alberto, Tagliaferri, Gianpiero, ...
We present Chandra and VLT observations of the X-Ray Flash XRF 040812. The X-ray analysis reveals with high precision the position of a hard, fading source. A careful analysis of our I-band VLT...
X-ray flare in XRF 050406: evidence for prolonged engine activity (2007)
Romano, Patrizia, Moretti, Alberto, Banat, P.L., Burrows, David N., Campana, Sergio, Chincarini, Guido, ...
We present observations of XRF 050406, the first burst detected by Swift showing a flare in its X-ray light curve. During this flare, which peaks at t_peak ~210s after the BAT trigger, a flux...
Optical emission from GRB 050709: a short/hard GRB in a star forming galaxy (2007)
Covino, Stefano, Malesani, Daniele, Israel, GianLuca, D'Avanzo, Paolo, Antonelli, L. Angelo, Chincarini, Guido, ...
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-ray source and is...
The short-duration GRB 050724 host galaxy in the context of the long-duration GRB hosts (2007)
Gorosabel, Javier, Castro-Tirado, A.J., Guziy, S., Reverte, D., Antonelli, A., ...
We report optical and near-infrared broad band observations of the short-duration GRB 050724 host galaxy, used to construct its spectral energy distribution (SED). Unlike the hosts of long-duration...
Antonelli, L. Angelo, Testa, Vincenzo, Romano, Patrizia, Guetta, Dafne, Torii, Ken'ichi, D'Elia, Valerio, ...
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 mode. A...
The frontier of darkness: the cases of GRB 040223, GRB 040422, GRB 040624 (2007)
D'Avanzo, Paolo, Filliatre, Philippe, Goldoni, P., Antonelli, L. Angelo, Campana, Sergio, Chincarini, Guido, ...
Understanding the reasons for the faintness of the optical/near-infrared afterglows of the so-called dark bursts is essential to assess whether they form a subclass of GRBs, and hence for the use of...
Evidence for a Supernova Associated with the X-ray Flash 020903 (2007)
Bersier, David, Fruchter, A.S., Gorosabel, Javier, Levan, A., Covino, Stefano, ...
We present ground-based and Hubble Space Telescope optical observations of the X-ray flash (XRF) 020903, covering 300 days. The afterglow showed a very rapid rise in the first day, followed by a...
Models for the Type Ic Hypernova SN 2003lw associated with GRB 031203 (2007)
Mazzali, Paolo A., Deng, Jinsong, Pian, Elena, Malesani, Daniele, Tominaga, Nozomu, Maeda, Keiichi, ...
The Gamma-Ray Burst 031203 at a redshift z=0.1055 revealed a highly reddened Type Ic Supernova, SN 2003lw, in its afterglow light. This is the third well established case of a link between a...
An enigmatic long-lasting gamma-ray burst not accompanied by a bright supernova (2007)
Della Valle, Massimo, Chincarini, Guido, Panagia, N., Tagliaferri, Gianpiero, Malesani, Daniele, Testa, Vincenzo, ...
Gamma-ray bursts (GRBs) are short, intense flashes of soft gamma-rays coming from the distant Universe. Long-duration GRBs (those lasting more than ~2 s) are believed to originate from the deaths of...
Molinari, Emilio, Vergani, Susanna D., Malesani, Daniele, Covino, Stefano
Gamma-ray burst (GRB) emission is believed to originate in highly relativistic fireballs. Currently, only lower limits were securely set to the initial fireball Lorentz factor Gamma_0. We aim to...
Near real-time selection of high redshift GRBs with Swift (2007)
Campana, Sergio, Tagliaferri, Gianpiero, Malesani, Daniele, Stella, L., D'Avanzo, Paolo, Chincarini, Guido, ...
A good fraction of GRBs detected by Swift are at a large redshift (up to z=6.3, so far). Their study allows us to investigate, among other things, the cosmic star formation in the early Universe...
Long-term monitoring of the X-ray afterglow of GRB 050408 with Swift/XRT (2007)
Capalbi, Milvia, Malesani, Daniele, Perri, Matteo, Giommi, Paolo, Covino, Stefano, Cusumano, Giancarlo, ...
We present observations of the X-ray afterglow of GRB 050408, a gamma-ray burst discovered by HETE-II. Swift began observing the field 42 min after the burst, performing follow-up over a period of 38...
The GRB afterglow onset observed by REM: fireball Lorentz factor and afterglow fluence (2007)
Malesani, Daniele, Molinari, Emilio, Vergani, Susanna, Covino, Stefano, Team, For The REM
We report observations of the early light curves of GRB 060418 and GRB 060607A, carried out with the pink robotic telescope REM. A clear peak is detected for both events, which is interpreted as the...
Gamma Ray Bursts Flares detected and observed by the Swift Satellite (2006)
Chincarini, Guido, Moretti, Alberto, Romano, Patrizia, Campana, Sergio, Covino, Stefano, Tagliaferri, Gianpiero, ...
The detection of flares with the Swift satellite triggered a lot of bservational and theoretical interest in these phenomena. As a consequence a large analysis effort started within the community to...
Models for the Type Ic Hypernova SN 2003lw associated with GRB 031203 (2006)
Mazzali, Paolo A., Deng, Jinsong, Pian, Elena, Malesani, Daniele, Tominaga, Nozomu, Maeda, Keiichi, ...
The Gamma-Ray Burst 031203 at a redshift z=0.1055 revealed a highly reddened Type Ic Supernova, SN 2003lw, in its afterglow light. This is the third well established case of a link between a...
Models for the type Ic hypernova SN 2003lw associated with GRB 031203 (2006)
Mazzali, Paolo A., Deng, Jingsong, Pian, Elena, Malesani, Daniele, Tominaga, Nozomu, Maeda, Keiichi, ...
Israel, GianLuca, Covino, Stefano, Mignani, Roberto, Stella, Luigi, Marconi, Gianni, Testa, Vincenzo, ...
The sky region including the Chandra position of SGR 1806-20 was monitored in the IR band during 2004, following its increased high energy bursting activity. Observations were performed using...
Swift XRT and VLT Observations of the Afterglow of GRB 041223 (2005)
Burrows, David N., Hill, Joanne E., Chincarini, Guido, Tagliaferri, Gianpiero, Campana, Sergio, Moretti, Alberto, ...
The Swift Gamma-Ray Burst Explorer, launched on 2004 November 20, is a multiwavelength, autonomous, rapid-slewing observatory for gamma-ray burst (GRB) astronomy. On 2004 December 23, during the...
Gamma-Ray Bursts and Afterglow Polarisation (2004)
Covino, Stefano, Rossi, Elena, Lazzati, Davide, Malesani, Daniele, Ghisellini, Gabriele
Polarimetry of Gamma-Ray Burst (GRB) afterglows in the last few years has been considered one of the most effective tool to probe the geometry, energetic, dynamics and the environment of GRBs. We...
Unveiling the multi-wavelength phenomenology of Anomalous X-ray Pulsars (2003)
Israel, GianLuca, Stella, Luigi, Covino, Stefano, Campana, Sergio, Angelini, Lorella, Mignani, Roberto, ...
During 2002-2003 the number of IR-identified counterparts to the Anomalous X-ray Pulsars (AXPs) has grown to four (4U0142+614, 2E2259+584, 1E 1048-59 and 1RXS J170849-400910) out of the six assessed...
Unveiling the nature of the 321s Orbital Period X-ray source RX J0806.3+1527 (2003)
Israel, GianLuca, Stella, Luigi, Covino, Stefano, Campana, Sergio, Marconi, Gianni, Mauche, Christopher W., ...
A nearly simultaneous X-ray/optical (Chandra and VLT) observational campaign of RX J0806.3+1527 has been carried out during November 2001. These observations allowed us to phase the X-ray and optical...
Rea, Nanda, Israel, Gian Luca, Stella, Luigi, Oosterbroek, Tim, Mereghetti, Sandro, Angelini, Lorella, ...
We report the results of a long observation of the anomalous X-ray pulsar 1RXS J170849-400910 obtained with the BeppoSAX satellite in August 2001. The best-fit phase-averaged spectrum was an absorbed...
Polarization of Gamma--Ray Burst Optical and Near-Infrared Afterglows (2003)
Covino, Stefano, Ghisellini, Gabriele, Lazzati, Davide, Malesani, Daniele
Gamma-Ray Burst afterglow polarization measurements, in spite of their intrinsic difficulties, have been carried out for a number of events that begins to be adequate to draw some general statistical...
REM - Rapid Eye Mount. A fast slewing robotized infrared telescope (2001)
Covino, Stefano, Zerbi, Filippo, Chincarini, Guido, Rodono', Marcello, Ghisellini, Gabriele, Antonelli, Angelo, ...
The main goal of the REM project is the observation of prompt afterglow of Gamma-Ray Burst (GRB) events. Such observations at Near InfraRed (NIR) wavelengths are even very promising, since they allow...
Covino, Stefano, Negueruela, Ignacio, Campana, Sergio, Israel, Gianluca, Polcaro, Francesco, Stella, Luigi, ...
We report on the discovery and confirmation of the optical counterparts of the two transient X-ray pulsars, RXJ0052.1-7319 and XTEJ0111.2-7317. In the narrow (~3" radius) X-ray error circle of...
Israel, GianLuca, Negueruela, Ignacio, Campana, Sergio, Covino, Stefano, Di Paola, Andrea, Maxwell, Diana H., ...
We report on the identification of the optical/IR counterpart of the 29.5-s transient X-ray pulsar GS 1843+009. We re-analysed an archival ROSAT HRI observation of GS 1843+009, obtaining a new...
The BMW X-ray Cluster Survey (2001)
Moretti, Alberto, Guzzo, Luigi, Campana, Sergio, Covino, Stefano, Lazzati, Davide, Longhetti, Marcella, ...
We describe the main features of the BMW survey of serendipitous X-ray clusters, based on the still unexploited ROSAT-HRI archival observations. The sky coverage, surface density and first deep...
GRB Redshift determination in the X-ray band (1999)
Campana, Sergio, Ghisellini, Gabriele, Lazzati, Davide, Haardt, Francesco, Covino, Stefano
If gamma-ray bursts originate in dense stellar forming regions, the interstellar material can imprint detectable absorption features on the observed X-ray spectrum. Such features can be detected by...
Further evidence that 1RXS J170849.0-400910 is an Anomalous X-ray pulsar (1999)
Israel, GianLuca, Covino, Stefano, Stella, Luigi, Campana, Sergio, Mereghetti, Sandro
We report the results of two ROSAT HRI observations of the recently discovered 11s X-ray pulsar 1RXS J170849.0-400910. A refined position with a smaller error radius (10" uncertainty) and a new spin...
The Active Corona of HD 35850 (F8 V) (1998)
Gagne, Marc, Valenti, Jeff A., Linsky, Jeffrey L., Tagliaferri, Gianpiero, Covino, Stefano, Guedel, Manuel
We present Extreme Ultraviolet Explorer spectroscopy and photometry of the nearby F8 V star HD 35850 (HR 1817). The EUVE spectra reveal 28 emission lines from Fe IX and Fe XV to Fe XXIV. The Fe XXI...
Bright Stars and Metallicity Spread in the Globular Cluster Omega Centauri (1998)
Ortolani, Sergio, Covino, Stefano, Carraro, Giovanni
The globular cluster Omega Centauri (NGC 5139) is the most massive and brightest cluster in our Galaxy. It has also a moderately high mass to light ratio (3.6) and an anomalous flattening (0.83) for...
CCD Photometry of the High Amplitude Delta Scuti Stars V798 Cyg and V831 Tau (1998)
Musazzi, Federica, Poretti, Ennio, Covino, Stefano, Ferro, Armando Arellano
The possibility to perform the frequency analysis of the light variation of V798 Cyg on the basis of a more accurate set of data and the Fourier decomposition of the new light curve of V831 Tau...