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We present the results of the prompt, early and afterglow optical observations of five γ‐ray bursts (GRBs): GRB 100901A, GRB 100902A, GRB 100905A, GRB 100906A and GRB 101020A. These observations were made with the Mobile Astronomical System of TElescope‐Robots in Russia (MASTER‐II Net), the 1.5‐m telescope of the Sierra Nevada Observatory and the 2.56‐m Nordic Optical Telescope. For two sources, GRB...
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