Optical studies of potential counterparts for unidentified EGRET sources

Computer Science

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Gamma-Ray Sources, Gamma-Ray Bursts, Visible

Scientific paper

We present optical observations of candidate X-ray counterparts for the EGRET sources 3EG J2020+4017, 3EG J0010+7309 and 3EG J1835+5918. Preliminary spectroscopic observations of the late-type star coincident with the X-ray counterpart of 3EG J2020+4017, the γ-Cygni source, show no evidence of binariety. In the case of 3EG J0010+7309, the CTA-1 source, we performed deep optical imaging, finding a red V~22 magnitude object inside the ROSAT contour. Finally, a detailed analysis of optical observations of several X-ray sources within the EGRET error box of 3EG J1835+5918 is presented. .

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