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14 papers · 2 filters
X-ray broad-band study of the symbiotic X-ray binary 4U 1954+31
N. Masetti, E. Rigon, E. Maiorano +5
(Abridged) We present results of several X-ray observations of the X-ray binary 4U 1954+31 performed with the satellites BeppoSAX, EXOSAT, ROSAT, RXTE, and Swift. We also studied t…
REM observations of GRB 060418 and GRB 060607A: the onset of the afterglow and the initial fireball Lorentz factor determination
E. Molinari, S. D. Vergani, D. Malesani +32
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 Gamm…
The cosmic X-ray background and the population of the most heavily obscured AGNs
Filippo Frontera, Mauro Orlandini, Raffaella Landi +7
We report on an accurate measurement of the CXB in the 15-50 keV range performed with the Phoswich Detection System (PDS) instrument aboard the BeppoSAX satellite. We establish tha…
Optical observations of GRB 060218/SN 2006aj and its host galaxy
Patrizia Ferrero, Eliana Palazzi, Elena Pian +1
The supernova SN 2006aj associated with GRB 060218 is the second-closest GRB-SN observed to date (=0.033) and is the clearest example of a SN associated with a Swift GRB with th…
X-ray Flashes or soft Gamma-ray Bursts? The case of the likely distant XRF 040912
G. Stratta, S. Basa, N. Butler +49
In this work, we present a multi-wavelength study of XRF 040912, aimed at measuring its distance scale and the intrinsic burst properties. We performed a detailed spectral and temp…
Constraints on an optical afterglow and on supernova light following the short burst GRB 050813
P. Ferrero, S. F. Sanchez, D. A. Kann +18
We report early follow-up observations of the error box of the short burst 050813 using the telescopes at Calar Alto and at Observatorio Sierra Nevada (OSN), followed by deep VLT/F…
Unveiling the nature of INTEGRAL objects through optical spectroscopy. V. Identification and properties of 21 southern hard X-ray sources
N. Masetti, L. Morelli, E. Palazzi +13
Optical spectroscopic identification of the nature of 21 unidentified southern hard X-ray objects is reported here in the framework of our campaign aimed at determining the nature…
The gamma-ray burst monitor for Lobster-ISS
L. Amati, F. Frontera, N. Auricchio +14
Lobster-ISS is an X-ray all-sky monitor experiment selected by ESA two years ago for a Phase A study (now almost completed) for a future flight (2009) aboard the Columbus Exposed P…
The GRB 060218/SN 2006aj event in the context of other Gamma-Ray Burst Supernovae
P. Ferrero, D. A. Kann, A. Zeh +15
The supernova SN 2006aj associated with GRB 060218 is the second-closest GRB-SN observed to date (z=0.033). We present Very Large Telescope, Liverpool Telescope, and Katzman Automa…
Physics of the GRB 030328 afterglow and its environment
E. Maiorano, N. Masetti, E. Palazzi +30
We report on the photometric, spectroscopic and polarimetric, monitoring of the optical afterglow of Gamma-Ray Burst (GRB) 030328 detected by HETE-2. Photometry, collected at 7 dif…
Unveiling the nature of INTEGRAL objects through optical spectroscopy. IV. A study of six new hard X-ray sources
N. Masetti, L. Bassani, A. Bazzano +9
We present further results from our ongoing optical spectrophotometric campaign at the Astronomical Observatory of Bologna in Loiano (Italy) on unidentified hard X-ray sources dete…
M-type giants as optical counterparts of X-ray sources 4U 1700+24 and 4U 1954+319
N. Masetti, M. Orlandini, E. Palazzi +2
We observed with Chandra two peculiar galactic X-ray sources, 4U 1700+24 and 4U 1954+319, which are suspected to have a M-type giant star as optical counterpart, in order to get an…
An optical supernova associated with the X-ray flash XRF 060218
E. Pian, P. A. Mazzali, N. Masetti +42
Long-duration gamma-ray bursts (GRBs) are associated with type Ic supernovae that are more luminous than average and that eject material at very high velocities. Less-luminous supe…
The broadband afterglow of GRB 030328
E. Maiorano, N. Masetti, E. Palazzi +10
We here report on the photometric, spectroscopic and polarimetric monitoring of the optical afterglow of the Gamma-Ray Burst (GRB) 030328 detected by HETE-2. We found that a smooth…