Monitoring the gamma-ray source 2cg 135+1 and the radio star lsi +61° 303

M. Tavani*, W. Hermsen, R. Van Dijk, M. Strickman, S. N. Zhang, R. S. Foster, P. S. Ray, J. Mattox, M. Ulmer, W. Purcell, M. Coe

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

17 Scopus citations


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. Previous observations of 2CG 135+1 are consistent with a positional coincidence of the gamma-ray source with LSI +61° 303. Since January 1994, we continuously monitored the time variable radio source GT 0236+610 with the Green Bank Interferometer. For the first time, gamma-ray observations of 2CG 135+1 can be correlated with an extensive database of radio observations of LSI +61° 303. We present OSSE and COMPTEL data obtained during the period MayJune 1994, and BATSE data for the period April 1994-January 1995. We discuss the possible time variability of the 7-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 and time variable gammaray sources in the Galaxy.

Original languageEnglish (US)
Pages (from-to)243-248
Number of pages6
JournalAstronomy and Astrophysics Supplement Series
Issue number4
StatePublished - Dec 1 1996


  • Gamma-rays
  • Individual
  • LSI +61 303; 2CG 135+1
  • Observations -x-rays
  • Stars stars

ASJC Scopus subject areas

  • General Physics and Astronomy


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