Abstract

We describe our ongoing program using the Fermi Gamma-Ray Space to search for gamma-ray emission from a source sample derived published surveys of galactic radio sources classified as variables or transients. We are also utilizing the Swift and INTEGRAL archives to make concurrent searches in the hard-X-ray domain. Radio emission was established as a ubiquitous property of gamma ray sources prior to the launch of Fermi. Subsequent examination of the composition of the two year source catalog of that mission, comprising some 1900 individual sources, further supports this idea. Known classes of galactic variable radio sources include high-mass X-ray binaries such as Cyg X-3 and LSI +61 303 which are now well established gamma-ray emitters. Those objects are often transient in nature and they are often revealed through survey observations in the radio or hard-X-ray bands.

Additional objects among this class may be revealed and establishing them as gamma-ray emitters would be of great interest. Other possible source classes include radio-loud magnetars, RRATs (Rotating Radio Transients) and flare stars. Most interestingly, totally unexpected phenomena could also be revealed. We have searched the Fermi data on multiple timescales for counterparts that would be likely to allude detection either in deep catalog searches or bright, transient searches as are routinely carried out by the Fermi consortium. We will describe our sample selection, data extraction and analysis methods and present results obtained to date, including several promising candidates.