Abstract
A large fraction of gamma-ray bursts temporarily emit optical light, i.e. optical afterglows and optical transients. So far, optical transients have only been detected after related gamma-ray satellite detection. However, taking into account their optical magnitudes at maximum light, these objects should be detectable in various historical and recent optical surveys, including the photographic sky patrol. Here we report on an extended study based on blink-comparison of 5004 Bamberg Observatory Southern Sky Patrol Plates performed within a student high school project (Jugend Forscht).
Highlights
It is known that a substantial fraction of gammaray bursts (GRBs) temporarily emit optical light, namely optical afterglows (OA) and optical transients (OT)
We report on the preliminary results of a study based on an extended blinkcomparison of the Bamberg Observatory Southern Sky Patrol Plates performed within a German high school student project (Jugend Forscht)
We focused on objects not previously classified, with emphasis on possible OT candidates
Summary
It is known that a substantial fraction of gammaray bursts (GRBs) temporarily emit (typically for minutes to weeks) optical light, namely optical afterglows (OA) and optical transients (OT) These phenomena have only been detected after related gamma-ray satellite detection. These objects should be detectable in various historical and recent optical surveys, including the photographic sky patrol, as they may be brighter than the limits of these surveys In addition to these triggers, one can expect to detect in optical surveys the as yet hypothetical orphan afterglows which may be observed in optical light but are not in gammarays due to different opening jet angles The southern patrol was taken from the Boyden Observatory observing station in South Africa for variable star research (Figure 1). The machine is still operational at the Bamberg Observatory, and it was used in our work for re-detection of the objects on the plates
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