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Discovery of the optical afterglow of XRF 040812: VLT and Chandra observations
P. D'Avanzo, D. Malesani, S. Campana +4
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 o…
Simultaneous multiwavelength observations of the Low/Hard State of the X-ray transient source SWIFT J1753.5-0127
M. Cadolle Bel, M. Ribo, J. Rodriguez +11
We report the results of simultaneous multiwavelength observations of the X-ray transient source SWIFT J1753.5-0127 performed with INTEGRAL, RXTE, NTT, REM and VLA on 2005 August 1…
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…
Near real-time selection of high redshift GRBs with Swift
S. Campana, G. Tagliaferri, D. Malesani +4
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…
The Remarkable Afterglow of GRB 061007: Implications for Optical Flashes and GRB Fireballs
C. G. Mundell, A. Melandri, C. Guidorzi +18
We present a multiwavelength analysis of Swift GRB 061007. The 2-m robotic Faulkes Telescope South (FTS) began observing 137 s after the onset of the gamma-ray emission, when the o…
A search for evidence of irradiation in Centaurus X-4 during quiescence
P. D'Avanzo, T. Munoz-Darias, J. Casares +2
We present a study of the neutron star X-Ray Transient Cen X-4. Our aim is to look for any evidence of irradiation of the companion with a detailed analysis of its radial velocity…
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…
An enigmatic long-lasting gamma-ray burst not accompanied by a bright supernova
M. Della Valle, G. Chincarini, N. Panagia +14
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…
Anatomy of A Dark Burst - The Afterglow of GRB 060108
S. R. Oates, C. G. Mundell, S. Piranomonte +20
We report the first detection of an optical afterglow of a GRB (060108) that would have been classified as 'dark' in the absence of deep, rapid ground-based optical imaging with th…
Hypernova Signatures in the Late Rebrightening of GRB 050525A
M. Della Valle, D. Malesani, J. S. Bloom +22
We report observations of GRB 050525A, for which a Gemini North spectrum shows its redshift to be z = 0.606. This is the third closest long GRB discovered by Swift. We observed its…
The frontier of darkness: the cases of GRB 040223, GRB 040422, GRB 040624
P. D'Avanzo, P. Filliatre, P. Goldoni +23
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 he…