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Based on extensions of the grand-canonical Quantum Monte-Carlo algorithm toincorporate magnetic fields, we provide numerical data confirming the existenceof a Kosterlitz-Thouless transition in the attractive Hubbard model. Here, wecalculate the temperature derivative of the superfluid density, to pin down thetransition. Away from half-band filling, the above quantity, shows a responsewhich increases with lattice size at the transition temperature. In contrast,such a signal is not observed for the case of a half-band filling.Comment: Latex 8 pages, 3 figures (in postscript format) appendded at the end  of the fil

Temperature derivative of the superfluid density in the attractive Hubbard model