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NiBr was produced in a supersonic free jet expansion in argon by the reaction of laser ablated nickel atom and bromoethane $(C2H5Br)$ vapour. High resolution laser induced fluorescence spectra between 724 and 810 nm have been obtained using a c.w. single frequency Ti:sapphire laser. 8 bands have been recorded and 3 were assigned to the $\mathrm{<mrow\; data-mjx-texclass="ORD">2</mrow>}\Pi 3/2-X2\Pi 3/2$ transition. Transition lines from four isotopic molecules: $\mathrm{<mrow\; data-mjx-texclass="ORD">58</mrow>}Ni79Br$, $\mathrm{<mrow\; data-mjx-texclass="ORD">58</mrow>}Ni81Br$, $\mathrm{<mrow\; data-mjx-texclass="ORD">60</mrow>}Ni79Br$ and $\mathrm{<mrow\; data-mjx-texclass="ORD">60</mrow>}Ni81Br$, are observed and analysed. Least squares fit of measured lines of each isotopic molecule was performed. Molecular constants of all four isotopic molecules will be reported. Acknowledgement: This work was carried out with support from the Hong Kong Research Grants Council.