We present optical and near-IR observations of QX Nor, the counterpart to the recurrent soft X-ray transient X1608-52, after its reappearance following the X-ray outburst in February 1996. The object has been seen only once before, during an Xray outburst in 1977. Data from 3–5 months after the outburst show the counterpart at a mean magnitude of R = 20.2 and variable on timescales of days. A c...

We present results from a multi-wavelength campaign to monitor the 2005 outburst of the low-mass young star V1118 Ori. Although our campaign covers the X-ray, optical, infrared, and radio regimes, we focus in this Letter on the properties of the X-ray emission in V1118 Ori during the first few months after the optical outburst. Chandra and XMM-Newton detected V1118 Ori at three epochs in early ...

We report photometry and spectroscopy of the evolution of Nova Sagittarii 1994 #1 (V4332 Sagittarii) during outburst. We compare the photometric and spectral evolution of this outburst to known classes of outbursts – including classical novae and outbursts occurring on symbiotic stars – and find this object does not conform to any known class of outburst. The closest match to the behavior of th...

A large radio outburst from Sgr A* was observed during the VLA weekly monitoring program at 2 cm, 1.3 cm and 7 mm, nearly coincident with the brightest X-ray flare detected to date with the XMM-Newton X-ray Observatory on 2002-10-03. The flux density of 1.9±0.2 Jy measured at 7 mm exceeds the mean value (1.00±0.01 Jy) by a factor of ∼ 2, one of the two highest increases observed during the past...

We present multiwavelength (optical, IR, radio) observations of CI Cam, the optical counterpart to the transient X-ray source XTE J0421+560. Pre-outburst quiescent observations reveal the presence of a dusty envelope around the system. Pronounced short term variability is observed at all wavebands from U–K, but no indication of prior flaring of a similar magnitude to the 1998 April outburst is ...

CSS J102913+404220 is a peculiar narrow line Seyfert 1 galaxy with an energetic nuclear optical outburst. We present detailed analysis of its multi-wavelength photometric and spectroscopic observations covering period decade since detect mid-infrared (MIR) flares delayed by about two months relative to the outburst, extremely high peak luminosity log(L_4.6um)>44 erg/s. The MIR at least order ma...

AA Tau, a classical T Tauri star in the Taurus cloud, has been the subject of intensive photometric monitoring for more than two decades due to its quasi-cyclic variation in optical brightness. Beginning in 2011, AA Tau showed another peculiar variation—its median optical though near-IR flux dimmed significantly, a drop consistent with a 4-mag increase in visual extinction. It has stayed in the...

We report on the highly variable and erratic long-term X-ray luminosity behavior of the only known accretion-driven millisecond X-ray pulsar SAX J1808.4–3658 during its 2000 outburst, as observed with the Rossi X-ray Timing Explorer (RXTE) satellite. The maximum observed luminosity is ∼ 2.5 × 10 ergs s (3–25 keV; for a distance of 2.5 kpc), which is approximately a factor of ten lower than that...

Crossing borehole is an effective means to eliminate the outburst risk of coal and gas. The influence inclination angle, diameter, drainage time on radius gas are studied by numerical simulation engineering example verification. study shows that changes in a “U” shape with increase angle. When angle α seam plane decreases, increases. Furthermore, mass around broken shear deformation, which cons...

Context. The dying radio sources represent a very interesting and largely unexplored stage of the active galactic nucleus (AGN) evolution. They are considered to be very rare, and almost all of the few known ones were found in galaxy clusters. However, considering the small number detected so far, it has not been possible to draw any firm conclusions about their X-ray environment. Aims. We pres...