Following the report of a new outburst of the accreting millisecond pulsar SAX J1808.4-3658 by Markwardt and Swank (ATel #1728), the source was observed using...
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PublicaciónNear-IR and Optical Observations of the Ongoing Outburst of SAX J1808.4-3658
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PublicaciónNew constraints on neutron star models of gamma ray bursts. I - EXOSAT observations of two gamma ray burst error boxes
Two EXOSAT observations of gamma-ray burst error boxes and their possibly associated optical transients are discussed. No point source was detected in either...
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PublicaciónNew NGC 6440 transient declining rapidly
The new transient LMXB in NGC 6440 (CXOGlb J174852.7-202124; Atel #2139) is declining rapidly. RXTE observed NGC 6440 on July 30 (18:47 to 19:26 TT). The PCA...
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PublicaciónNew outburst of the accreting millisecond X-ray pulsar NGC 6440 X-2 and discovery of a strong 1 Hz modulation in the light-curve
On June 11th, 2010, RXTE/PCA galactic bulge scan observations showed an increase in activity from the globular cluster NGC 6440. Two accreting millisecond X-ray...
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PublicaciónNew outburst of the accreting-millisecond X-ray pulsar NGC 6440 X-2
On Friday 19th, 2010 (19h 13m 26s UT), the RXTE galactic bulge scans detected a flux excess in the direction of the globular cluster NGC 6440. This globular...
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PublicaciónNew outbursts of two faint X-ray transients (GRS 1741.9-2853 and XMM J174457-2850.3) located in the Galactic center region
The Galactic Center region was observed in a series of 7 pointings with the Chandra X-ray Observatory on 5 June 2005 01:44-13:08 UTC. During these observations...
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PublicaciónObservational properties of accretion discs: Precessing and warped?
Over the last 40 years, X-ray astronomy missions have revealed long-term, superorbital periods in a variety of X-ray binaries. These modulations can provide...
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PublicaciónObservations of Cygnus X-2 with IUE: Ultraviolet results from a multiwavelength campaign
The observations of the low-mass x ray binary, Cyg X-2, taken with the International Ultraviolet Explorer (IUE) in a campaign conducted in June and October of...
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PublicaciónOn the presence of two discs in the X-ray/Be binary A 0535 + 26/HDE 245770
The analysis of the efficiency of accretion in the X-ray binary system A 0535 + 26/HDE 245770 and of the specific angular momentum of the matter accreted during...