PKS 1510-089: Fifteen years of X-ray Monitoring

The blazar PKS 1510-089 is one of the best-monitored of all blazars, due to near-continuous monitoring by the RXTE and SWIFT satellites at weekly or better intervals. The RXTE data, in particular, provide a well-sampled (~twice per week for 10 months per year) 3-color (2-4 keV, 4-7 keV and 7-10 keV) light curve spanning from 1996 to 2011. SWIFT data both overlap with the RXTE data stream and extend it up through the present day. The resulting light-curve gives us an excellent tool to correlate with Fermi observations. Both Fermi and SWIFT have observed the source from 2008 to 2015. We will present an analysis of the light curve, including a search for orphan flares (i.e., flares observed in only a single band), one of which was detected in early 2009 in PKS 1510-089 by Marscher et al. (2010). Cross-correlation of multi-wavelength light curves and studies of orphan flares could provide insight into leptonic and hadronic blazar emission models.