16 papers
Discovery of a kHz QPO in 2S 0918-549
Peter G. Jonker, Michiel van der Klis, Jeroen Homan +6
We report the discovery of a kilohertz quasi-periodic oscillation (kHz QPO) in the low-mass X-ray binary (LMXB) 2S 0918-549. The kHz QPO has a frequency of 1156+-9 Hz, a FWHM of 70…
A model-independent analysis of the variability of GRS 1915+105
T. Belloni, M. Klein-Wolt, M. Mendez +2
We analyzed 163 observations of the microquasar GRS 1915+105 made with the Rossi X-ray Timing Explorer (RXTE) in the period 1996-1997. For each observation, we produced light curve…
Near-infrared detection and optical follow-up of the GRB990705 afterglow
N. Masetti
Optical and near-infrared observations of the GRB990705 error box were carried out with ESO telescopes at La Silla and Paranal in Chile and with the NOAO SPIREX 0.6-meter telescope…
VLT observations of GRB 990510 and its environment
K. Beuermann, F. V. Hessman, K. Reinsch +10
We present BVRI photometry and spectrophotometry of GRB990510 obtained with the ESO VLT/Antu telescope during the late decline phase. Between days 8 and 29 after the burst, the aft…
BeppoSAX monitoring of the ``anomalous'' X-ray pulsar 4U 0142+61
G. L. Israel, T. Oosterbroek, L. Angelini +7
The 8.7s X-ray pulsar 4U 0142+61 was monitored by BeppoSAX between January 1997 and February 1998. This source belongs to the rapidly growing class of "anomalous" X-ray pulsars (AX…
Spectral Energy Distributions and Light Curves of GRB 990123 and its Afterglow
T. J. Galama, M. S. Briggs, R. A. M. J. Wijers +38
Gamma-ray bursts (GRBs) are thought to result from the interaction of an extremely relativistic outflow interacting with a small amount of material surrounding the site of the expl…