Identification and Analyses in Optical Light of Gamma-Ray Sources with Astronomical Archival Plates

<table>IGR J12349-6434 = RT Cru, hard X-ray symbiotic star, on Leiden Franklin Adams Plates. INTEGRAL gamma-ray source visible on astronomical  plates taken by 100 years old optical telescope. Violent (amplitude 3 magnitudes) optical brightness variations about 80 years ago.</table>

Advances in Astronomy

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Figure 3: Identification and Analyses in Optical Light of Gamma-Ray Sources with Astronomical Archival Plates 