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We introduce a novel compact 4-channel beam splitter which is based on acombination of dichroic coatings and internal total reflection, similar inconcept to the interference double-prism invented by K\"osters 90 years ago.Used with a rapidly-slewing 50 cm telescope in space, this would allow todouble the presently known gamma-ray bursts at high (>5) redshift within 2years.

A novel compact 4-channel beam splitter based on a K\"osters-type prism