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Subsections

2 Data

The Sonneberg sky patrol is operated every clear night by an array of twelve $30 \times 30$ deg2 cameras with photographic records. Blue and red emulsions are in use and their mean limiting magnitudes amount to about mag 14.5.

The Ondrejov sky patrol is operated at 11 ground stations equipped by 2 guided and 11 fixed photographic red sensitive cameras reaching lim magnitudes between 4 (for fixed cameras) and 11 (for guided cameras) over fields of view of 180 deg diameter. The recent improvements will result in the sensitivity increase to mag 6 for fixed and to magnitude 12-13 for guided cameras in the best cases.

2.1 The Ondrejov sky patrol parameters

Both data sets have been examined for observations covering the GRB positions at times during as well as immediately before and after the triggers (within 2 days).


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