A Multiwavelength Investigation of the Relationship between 2CG 135+1 and LSI +61°303

We present the results of a multiwavelength monitoring campaign targeting the γ-ray source 2CG 135+1 in an attempt to confirm the association of this object with the radio/Be/X-ray binary system LSI +61°303. The campaign included simultaneous radio, optical, infrared, and hard X-ray/γ-ray observations carried out with a variety of instruments, covering (not continuously) almost three binary cycles of LSI +61°303 during the period 1994 April-July. Three separate OSSE observations of the γ-ray source were carried out, covering different phases of the radio light curve. Hard X-ray/γ-ray emission was detected from the direction of 2CG 135+1 during the first of these OSSE observations. The signal-to-noise ratio of the OSSE observations was insufficient to establish a spectral or intensity correlation of the high-energy emission with simultaneous radio, optical, and infrared emission of LSI +61°303. We briefly discuss the theoretical implications of our observations.