Observation by COS-B of the gamma-ray source 2CG195/plus/04
Caraveo, P. A.; Bignami, G. F.; Hermsen, W.; Masnou, J. L.; Bennett, K.; Buccheri, R.; Kanbach, G.; Paul, J. A.; Bloemen, J. B. G. M.; Mayer-Hasselwander, H.
France, Netherlands, Italy, Germany
Abstract
Data accumulated from observations of the high-energy gamma-ray source 2CG195(plus)04 are used to improve the position and energy spectrum of the source, and to search for short term variability. Skymaps from four observations in three energy ranges are analyzed using the cross-correlation method by Hermsen (1980), and results are within the errors quoted on the position in the second COS-B catalog of gamma-ray sources. The spectrum is found to be consistent with a power-law spectrum with an index of about 1.8 between 100 MeV and 3.2 GeV. In searching for short term variability, no periodicity is observed around the 59 s value.