A simple empirical redshift indicator for gamma-ray bursts

Abstract

We propose a new empirical redshift indicator for gamma-ray bursts. This indicator is easily computed from the gamma-ray burst spectral parameters, and its duration, and it provides ``pseudo-redshifts'' accurate to a factor two. Possible applications of this redshift indicator are briefly discussed.

Final version, 4 pages, 3 figures, A&A, vol. 407, L1

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