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The recent launch of the Fermi Gamma-ray Space Telescope has renewed interest in the rare class of high mass X-ray binaries that also have MeV-TeV emission. Two of the best known "gamma-ray binaries" are LS I +61 303 and LS 5039. They have long been modeled as microquasars with stellar winds accreting onto a compact object, producing high energy emission and relativistic jets. However, their emission properties might be better explained by a relativistic pulsar wind colliding with the stellar wind. To resolve the controversy, I am currently leading a coordinated multiwavelength campaign to identify the nature of these sources and understand the high energy emission mechanisms. I will present preliminary results from our ongoing RXTE, optical, and radio flux monitoring as well as pulsar searches with the Green Bank Telescope. |