Monitoring the gamma-ray source 2CG 135+1 and the radio star LSI +61 303.

We report the results of a CGRO multi-instrument series of observations of the unidentified gamma-ray source 2CG 135+1 and of its possible counterpart, the peculiar radio source GT 0236+610 coincident with the Be star LSI+61 303. We monitored the time variable radio source GT 0236+610 during the CGRO observations. OSSE and COMPTEL data were obtained during the period May-June 1994, and BATSE data for the period April 1994-January 1995. We discuss the time variability of the gamma-ray emission and spectral properties of 2CG~135+1. Understanding the nature of 2CG 135+1 may be of crucial importance for the interpretation of a class of unidentified time variable gamma-ray sources in the Galaxy.