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Taking the pulse of the shortest orbital period binary system RX J0806.3+1527
G. L. Israel, S. Covino, S. Dall'Osso +8
RX J0806.3+1527 is thought to be a 321s orbital period (the shortest known) double white dwarf binary system. According to the double degenerate binary (DDB) scenario this source i…
Are all Gamma Ray Bursts like GRB 980425, GRB 030329 and GRB 031203?
Dafne Guetta, Rosalba Perna, Luigi Stella +1
We study the probability that three GRBs (980425, 030329, 031203) are found within z=0.17, given the luminosity functions consistent with the log N-log S relationship for classical…
Indirect evidence for an active radio pulsar in the quiescent state of the transient ms pulsar SAX J1808.4-3658
S. Campana, P. D'Avanzo, J. Casares +6
Millisecond radio pulsars are neutron stars that have been spun-up by the transfer of angular momentum during the low-mass X-ray binary phase. The transition from an accretion-powe…
A flash in the dark: UVES/VLT high resolution spectroscopy of GRB afterglows
F. Fiore, V. D'Elia, D. Lazzati +17
We present the first high resolution (R=20000--45000, corresponding to 14 km/s at 4200A to 6.6 km/s at 9000A) observations of the optical afterglow of Gamma Ray Bursts. GRB020813 a…
A puzzling event during the X-ray emission of the binary system GX 1+4
Nanda Rea, Luigi Stella, Gian Luca Israel +4
We report on a long X-ray observation of the slow-rotating binary pulsar GX 1+4. BeppoSAX observed, in the 0.1-200 keV energy range, an event in which the source flux dropped for a…
The discovery of hard X-ray emission in the persistent flux of the Rapid Burster
M. Falanga, R. Farinelli, P. Goldoni +3
We report the first detection with INTEGRAL of persistent hard X-ray emission (20 to 100 keV) from the Rapid Burster (MXB 1730-335), and describe its full spectrum from 3 to 100 ke…