A Search for Gamma-Ray Emission from Variable or Transient Galactic Radio Sources

(Abstract) We describe a recent effort using the Fermi Large Area Telescope to search for gamma-ray emission from a source sample derived from published surveys of variable or transient galactic radio sources. We are also making follow up searches for hard-X-ray emission using archival data from Swift and INTEGRAL. We describe our sample selection, data extraction and analysis methods and present results obtained to date. Radio transients could, for example, with high-mass X-ray binaries similar to LS I+61 303, but at lower intensities. We’ve searched about 45 source fields with Fermi, using multi epoch analyses – days to weeks – as well as approximately 12000 data sequences (~102 to 103-s duration) with Swift. We have also constructed INTEGRAL light curves for the 10 best Fermi candidates. This led to 10 (>200-MeV) Fermi candidates, or and several marginal candidate hard-X-ray transients. We speculate on possible non-gamma-ray source associations and on potential source populations that could be revealed through our analysis. 1