Multiwavelength light curves of 3C 279 during January and February 2006. The gray-shaded area indicates the core campaign period of the INTEGRAL, Chandra, and Swift observations; the vertical dashed line indicates the time of the MAGIC VHE γ-ray detection. Units of the X-ray fluxes are: F_2 − 10 [erg cm^-2 s^-1] and F₂₀₋₆₀ [10^-4 ph cm^-2 s^-1]. The top panel shows the RXTE (2−10 keV) and Swift/XRT (0.2−10 keV) spectral indices. The RXTE data are from Chatterjee et al. (2008), updated by A. Marscher (private comm.).