3 Conclusion

Cosmic gamma ray bursts is a continuing enigma for astrophysics. We are proposing Ballerina, a small satellite to provide accurate GRB positions at a rate an order of magnitude larger than Beppo-SAX. The Ballerina spectral data will place powerful constraints on the theoretical work being done to understand GRBs. Establishing the cosmological distances to GRBs, and understanding their nature will provide us with a new and independent probe of the structure of the Universe - complementary to supernovae, quasars and clusters of galaxies.

Acknowledgements

Part of this work was supported by the Danish Space Advisory Board.