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Correlations between Low-Frequency QPOs and Spectral Parameters in XTE J1550-564 and GRO J1655-40
Gregory J. Sobczak, Jeffrey E. McClintock, Ronald A. Remillard +5
Utilizing observations obtained with the Rossi X-ray Timing Explorer, we examine correlations between the properties of 0.08-22 Hz variable frequency QPOs and the X-ray spectral pa…
X 1908+075: An X-ray Binary with a 4.4 day Period
Linqing Wen, Ronald A. Remillard, Hale V. Bradt
X 1908+075 is an optically unidentified and highly absorbed X-ray source that appears in early surveys such as Uhuru, OSO-7, Ariel V, HEAO-1, and the EXOSAT Galactic Plane Survey.…
Localizations of Thirteen Gamma-ray Bursts by the All-Sky Monitor on RXTE
D. A. Smith, A. M. Levine, H. V. Bradt +9
The All-Sky Monitor (ASM) on the Rossi X-ray Timing Explorer (RXTE) has been used to localize thirteen confirmed X-ray counterparts to Gamma-Ray Bursts (GRBs) detected over three y…
HST/STIS UV Spectroscopy of Two Quiescent X-ray Novae: A0620-00 and Centaurus X-4
Jeffrey E. McClintock, Ronald A. Remillard
In 1998 we made UV spectroscopic observations with HST/STIS of A0620-00 and Cen X-4, which are two X-ray novae (aka soft X-ray transients). These binary systems are similar in all…
QPOs and Spectral States in GRS 1915+105
Michael P. Muno, Edward H. Morgan, Ronald A. Remillard
We present results from the analysis of X-ray energy spectra and quasi- periodic oscillations (QPOs) from a set of observations which samples a broad range of time variability in G…
X-ray Nova XTE J1550-564: Discovery of a QPO Near 185 Hz
R. A. Remillard, J. E. McClintock, G. J. Sobczak +4
We have investigated the X-ray timing properties of XTE J1550-564 during 60 RXTE PCA observations made between 1998 September 18 and November 28. We detect quasi-periodic oscillati…
X-ray Nova XTE J1550-564: Optical Observations
R. K. Jain, C. D. Bailyn, J. A. Orosz +2
We report the identification of the optical counterpart of the X-ray transient XTE J1550-564 described in two companion papers by Sobczak et al (1999) and Remillard et al (1999). W…
X-ray Nova XTE J1550-564: RXTE Spectral Observations
G. J. Sobczak, J. E. McClintock, R. A. Remillard +4
Excellent coverage of the 1998 outburst of the X-ray Nova XTE J1550-564 was provided by the Rossi X-ray Timing Explorer. XTE J1550-564 exhibited an intense (6.8 Crab) flare on 1998…