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Chandra and XMM-Newton observations of the low-luminosity X-ray pulsators SAX J1324.4-6200 and SAX J1452.8-5949
Ramanpreet Kaur, Rudy Wijnands, Alessandro Patruno +5
We present results from our Chandra and XMM-Newton observations of two low-luminosity X-ray pulsators SAX J1324.4-6200 and SAX J1452.8-5949 which have spin-periods of 172 s and 437…
The performance of the blue prime focus Large Binocular Camera at the Large Binocular Telescope
E. Giallongo, R. Ragazzoni, A. Grazian +23
We present the characteristics and some early scientific results of the first instrument at the Large Binocular Telescope (LBT), the Large Binocular Camera (LBC). Each LBT telescop…
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 afterglow onset for GRB060418 and GRB060607A
S. Covino, S. D. Vergani, D. Malesani +32
Gamma-ray burst are thought to be produced by highly relativistic outflows. Although upper and lower limits for the outflow initial Lorentz factor are available, observationa…
The Elongated Structure of the Hercules dSph from Deep LBT Imaging
Matthew G. Coleman, Jelte T. A. De Jong, Nicolas F. Martin +16
We present a deep, wide-field photometric survey of the newly-discovered Hercules dwarf spheroidal galaxy, based on data from the Large Binocular Telescope. Images in B, V and r we…
Simultaneous Swift and REM monitoring of the blazar PKS0537-441 in 2005
E. Pian, P. Romano, A. Treves +24
The blazar PKS0537-441 has been observed by Swift between the end of 2004 and November 2005. The BAT monitored it recurrently for a total of 2.7 Ms, and the XRT and UVOT pointed it…
REM near-IR and optical multiband observations of PKS2155-304 in 2005
A. Dolcini, F. Farfanelli, S. Ciprini +23
Spectral variability is the main tool for constraining emission models of BL Lac objects. By means of systematic observations of the BL Lac prototype PKS 2155-304 in the infrared-o…
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…
Infrared photometry of Cepheids in the LMC clusters NGC 1866 and NGC 2031
Vincenzo Testa, Marcella Marconi, Ilaria Musella +6
Near infrared (IR) studies of Cepheid variables in the LMC take advantage of the reduced light curve amplitude and metallicity dependence at these wavelengths. This work presents s…
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…
Red Giant stars in the Large Magellanic Cloud clusters
A. Mucciarelli, L. Origlia, F. R. Ferraro +2
We present deep J,H,Ks photometry and accurate Color Magnitude Diagrams down to K ~18.5, for a sample of 13 globular clusters in the Large Magellanic Cloud. This data set combined…
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…
A rapid and dramatic outburst in Blazar 3C 454.3 during May 2005 - Optical and infrared observations with REM and AIT
L. Fuhrmann, A. Cucchiara, N. Marchili +18
The flat-spectrum radio quasar 3C 454.3 is well known to be a highly active and variable source with outbursts occurring across the whole electromagnetic spectrum over the last dec…
Multiband Photometry of the Blazar PKS 0537-441: A Major Active State in December 2004 - March 2005
A. Dolcini, S. Covino, A. Treves +18
Multiband VRIJHK photometry of the Blazar PKS 0537-441 obtained with the REM telescope from December 2004 to March 2005 is presented. A major period of activity is found with more…
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…
GRB 021004 modelled by multiple energy injections
A. de Ugarte Postigo, A. J. Castro-Tirado, J. Gorosabel +43
GRB 021004 is one of the best sampled gamma-ray bursts (GRB) to date, although the nature of its light curve is still being debated. Here we present a large amount (107) of new opt…
Discovery and Monitoring of the likely IR Counterpart of SGR 1806-20 during the 2004 gamma-ray burst-active state
GianLuca Israel, Stefano Covino, Roberto Mignani +9
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 perf…
A multiwavlength study of PSR B0628-28: The first overluminous rotation-powered pulsar?
Werner Becker, Axel Jessner, Michael Kramer +2
The ROSAT source RX J0630.8-2834 was suggested by positional coincidence to be the X-ray counterpart of the old field pulsar PSR B0628-28. This association, however, was regarded t…
VLT FORS-1 observations of NGC 6397: Evidence for mass segregation
G. Andreuzzi, V. Testa, G. Marconi +3
We present (V,V-I) VLT-FORS1 observations of the Galactic Globular Cluster NGC 6397. We derive accurate color--magnitude diagrams and luminosity functions (LFs) of the cluster Main…
Probing the RGB-phase transition: Near-IR photometry of six intermediate age LMC clusters
Francesco R. Ferraro, Livia Origlia, Vincenzo Testa +1
This is the first of a series of papers devoted to a global study of the photometric properties of the red stellar sequences in a complete sample of the Large Magellanic Cloud clus…
The Distance to NGC 5904 (M 5) via the Subdwarfs Main Sequence Fitting Method
Vincenzo Testa, Alessandro Chieffi, Marco Limongi +2
We present a determination of the distance modulus of the globular cluster NGC 5904 (M 5), obtained by means of the subdwarf main-sequence fitting on the (V,V-I) color-magnitude di…
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…
Near-Infrared photometry of LMC cluster Reticulum
M. Dall'Ora, G. Bono, J. Storm +11
We present near-infrared (JKs) time series data of the Large Magellanic Cloud (LMC) cluster Reticulum. The observing strategy and data reduction (DAOPHOTII/ALLFRAME) allowed us to…